Infernal: Cooldown reduced to 15 minutes, down from 1 hour. Duration reduced to 1 minute, down from 5 minutes+. Health increased by 30%, damage increased by 60%, and armor increased 30%.

Quote from Blizzard staff
Death Knight
Class changes list in the work, check the updated talent calculator for all the changes
 
Druid
Class changes list in the work, check the updated talent calculator for all the changes
Feral
 
    * Primal Tenacity now reduces the duration of Fear effects by 10/20/30% and reduces all damage taken while stunned by 10/20/30%. (Old version - 5/10/15% fear reduction and 5/10/15% damage reduction while stunned)
    * Infected Wounds effect now reduces the movement speed of the target by 10% and its attack speed by 3%. (Old version - 10% reduction to both movement and attack speed)
 
 
Restoration
 
    * Replenish now gives a 5/10/15% chance to restore 10 Energy/5 Rage/ 2% Mana or 10 Runic Power per tick. (Old version - 10 Energy/4 Rage/2% Mana/10 Runic Power)
 
 
Hunter
Class changes list in the work, check the updated talent calculator for all the changes
 
Mage
Class changes list in the work, check the updated talent calculator for all the changes
 
Arcane
 
    * Arcane Subtley - Lower your target's resistances by 5/10 changed to 15/30% dispel resist
    * Wand Specialization - Removed
    * Arcane Fortitude - Moved to Wand Specialization's spot, changed to 3 ranks, now provides 50/100/150% of your Intellect into armor.
    * Magic Absorption - Changed to 2 ranks, increases resistances by .5/1 per level, now only restores 1/2% of mana on full resist.
    * Arcane Impact - Renamed Spell Impact. Now increases the damage of your Arcane Explosion, Arcane Blast, Blast Wave, Fire Blast, Ice Lance, and Cone of Cold by 2/4/6%.
    * Student of the Mind - Moved to Tier 3
    * Focus Magic - New Tier 3 talent, increases magic damage taken by the target by 150, lasts 1 min or 50 charges.
    * Improved Mana Shield - Renamed Arcane Shielding, now increases the armor and resistances gained by the mage by 25/50%.
    * Improved Blink - Now reduces the mana cost of Blink by 25/50%, and chance to be hit for 4 sec after Blink by 15/30%.
    * Prismatic Cloak - Now reduces damage taken by 2/4/6% and Invisibility fade time by 1/2/3 sec
    * Arcane Potency - Reduced to 2 ranks, connected to Presence of Mind instead of Clearcasting, Increases critical strike chance of any spell by 30% when
    * Empowered Arcane Missiles - Renamed Arcane Empowerment, now Increases the damage of your Arcane Missiles spell by an amount equal to 15/30/45% of your spell power and the damage of your Arcane Blast by 3/6/9% of your spell power.
    * Potent Spirit - Removed, replaced by Arcane Flows. Reduces the cooldown of your Presence of Mind, Arcane Power and Invisibility spells by 30/60 secs.
    * Netherwind Presence - Reduced to 3 ranks and moved up a tier, now increases your spell haste by 2/4/6%.
    * Missile Barrage - Added in place of Netherwind Presence. Gives your Arcane Blast, Fireball, Frostbolt and Frostfire Bolt spells a 15% chance to reduce the channeled duration of the next Arcane Missiles spell by 2.5 secs and fire missiles every .5 secs.
 
 
Fire
 
    * Improved Fire Blast - Moved to Tier 1, now 2 ranks, Reduces the cooldown of your Fire Blast spell by 1/2 sec.
    * Incineration - Moved to tier 1, now 3 ranks, Increases the critical strike chance of your Fire Blast, Scorch, Arcane Blast and Cone of Cold spells by 2/4/6%.
    * Burning Determination - New Tier 2 talent, When Interrupted or Silenced you have a 50/100% chance to become immune to both mechanics for 10 seconds.
    * World in Flames - Moved to Tier 2, Increases the critical strike chance of your Flamestrike, Blast Wave, Dragon's Breath, Living Bomb, Blizzard and Arcane Explosion spells by 2/4/6%.
    * Flame Throwing - Moved to Tier 3
    * Impact - Moved to Tier 3
    * Pyroblast - Cast time reduced to 5 seconds
    * Improved Scorch - More damage types added, now your Scorch spells have a 33/66/100% chance to cause your target to be vulnerable to Fire, Frost and Arcane damage, increasing damage taken by 2/4/6/8/10% and lasts 30 seconds. Stacks up to 5 times.
    * Master of Elements - Fire and frost wording removed, now your spell criticals will refund 10% of their base mana cost.
    * Blast Wave - Knockback added, now a wave of flame radiates outward from the caster, damaging all enemies caught within the blast for 154 to 186 Fire damage, knocking them back and Dazing them for 6 seconds.
    * Fiery Payback - Changed to, When below 35% health all Physical and Fire damage taken is reduced by 10/20% and your Pyroblast spell's cast time is reduced by 1.75/3.5 secs.
    * Empowered Fireball - Changed to 3 ranks, Increases the damage of your Fireball spell by an amount equal to 5/10/15% of your spell power.
    * Firestarter - New talent added, Your Blast Wave and Dragon's Breath spells have a 15/30/45% chance to make your next Flamestrike spell instant cast. Lasts 10 seconds.
    * Dragon's Breath - Disorient changed from 3 sec to 5 sec
    * Burnout  - Talent changed to read, Increases your spell critical damage bonus with all Fire spells by 5/10/15/20/25% but your spell criticals cost an additional 1/2/3/4/5% of the spell's cost.
    * Living Bomb - Mana drain added, The caster becomes a living bomb, causing 51 Fire damage to all enemies within 10 yards every 2 sec. After 6 seconds, a fiery explosion occurs causing 212 Fire damage to all enemies within 10 yards and burning 106 mana, dealing damage equal to the amount drained.
 
 
Frost
 
    * Shattered Barrier - New Tier 6 talent that gives your Ice Barrier spell a 50/100% chance to trigger a Frost Nova when it is destroyed.
    * Winter's Grasp - Renamed to Fingers of Frost, which gives your Frost damage spells a 5/10% chance to apply the Fingers of Frost effect, which treats your next Frost spell cast on the target as if the target were Frozen. Lasts 10 seconds.
    * Brain Freeze - Changed to give your Frost damage spells have a 5/10/15% chance to cause your next Fireball spell to be instant cast and cost no mana.
    * Improved Water Elemental - Changed to increase the duration of your Summon Water Elemental spell by 5/10/15 sec and your Water Elemental heals all party or raid members 1/2/3% of their total health every 5 secs.
    * Chilled to the Bone - Changed to increase the damage caused by your Frostbolt, Frostfire Bolt and Ice Lance spells by 1/2/3/4/5% and reduces the movement speed of all chilled targets by an additional 2/4/6/8/10%.
    * Deep Freeze - Damage added, causes 694 to 806 Frost damage and stuns the target for 5 seconds. Only usable on Frozen targets.
 
 
Paladin
Class changes list in the work, check the updated talent calculator for all the changes
 
Retribution
 
    * Vindication: Gives the Paladin's damaging attacks a chance to reduce the target's attributes by 10/20% for 15 seconds (was only melee attacks and 3 Pts for 5/10/15%).
    * Pursuit of Justice: Reduces the chance you'll be hit by spells by 1/2% and increases movement and mounted movement speed by 8/15%. This does not stack with other movement speed increasing effects (was 3 Pts for 1/2/3% reduced chance to be hit by spells and 5/10/15% speed increase).
    * Eye for an Eye: All criticals against you cause 10/20% of the damage taken to the attacker as well. The damage caused by Eye for an Eye will not exceed 50% of the Paladin's total health (was 15/30% damage return for spell attacks only).
    * The Art of War: Reduces all damage taken by 1/2/3% and gives your Hand of Freedom a 33/66/100% chance to remove Stun effects.
    * Righteous Vengeance: Increases critical damage bonus of your Judgement and Divine Storm spells by 5/10/15/20/25% (was 3/6/9/12/15% for all damage criticals).
    * Divine Storm: Mana cost changed to 20% of base mana up from 12%.
 
 
Holy
 
    * New Spell: Divine Plea (5 Minutes cooldown, Channeled) - While channeling this spell, you gain 50% of your total mana over 6 seconds.
    * Holy Shock: Rank 1 mana cost reduced from 335 to 245. Healing increased from 351-379 to 481-519 (Blasts the target with Holy energy, causing 314 to 340 Holy damage to an enemy, or 481 to 519 healing to an ally).
    * Enlightened Judgements: Chance to hit added (Increases the range of your Judgement spells by 10/20 yards and increases your chance to hit by 2/4%).
    * Beacon of Light: Mana cost reduced from 780 to 675.
 
 
Protection
 
    * Guardian's Favor: Tooltip corrected (Blessing of Freedom renamed to Hand of Freedom).
    * Divine Guardian: This talent now affects Divine Shield and Divine Protection (While Divine Shield or Divine Protection is active 15/30% of all damage taken by party or raid members within 30 yards is redirected to the Paladin.).
    * Guarded by the Light: Reduces the mana cost of your Consecration, Holy Wrath and Avenger's Shield spells by 15/30% (was "Whenever you parry or dodge an attack you have a 10/20% chance to reduce the mana cost of your next Consecration, Holy Wrath or Avenger's Shield spell by 25/50%" ).
 
 
Priest
Class changes list in the work, check the updated talent calculator for all the changes
 
    * Rapture: Divine Aegis shield effect was added to also give back 5% of the damage absorbed in mana. (Causes you to gain mana equal to 0.5/1.0/1.5/2.0/2.5% of the healing done by your Greater Heal, Flash Heal and Penance spells, and 5% the damage absorbed by your Power Word: Shield and Divine Aegis is returned as mana to you.)
    * Aspiration: The cooldown of Penance is now also reduced by this talent. (Reduces the cooldown of your Inner Focus, Power Infusion, Pain Suppression and Penance spells by 10/20%.)
    * Improved Healing: Now affects Penance. (Reduces the mana cost of your Lesser Heal, Heal, Greater Heal and Penance spells by 5/10/15%.)
    * Circle of Healing: Cooldown removed. Rank 1 Mana cost changed from 300 to 370.
    * Penance: Rank 1 damage component lowered from 437 to 184 holy damage. Now instant cast. (Launches a volley of holy light at the target, causing 184 Holy damage to an enemy, or 670 to 756 healing to an ally every 1 sec for 3 seconds. Cooldown : 10 Seconds)
    * Dispersion: Cooldown reduced to 3 minutes down from 5 minutes.
 
 
Rogue
Class changes list in the work, check the updated talent calculator for all the changes
 
Shaman
Class changes list in the work, check the updated talent calculator for all the changes
 
Warlock
Class changes list in the work, check the updated talent calculator for all the changes
Destruction
 
    * Molten core now has a 5%/10%/15% chance, up from 4%/7%/10%
    * Nether Protection has been changed; now gives you a 10%/20%/30% chance once a spell (of any school) hits you you reduce all damage from that school by 60% for 10 secs.
    * Emberstorm now reduces the cast time of Immolate by 0.1/0.2/0.3/0.4/0.5 instead of 2%/4%/6%/8%/10%
    * Improved Soul Leech now restores mana to you and your summoned demon by 5%/10%, down from 15%/30%.
    * Backdraft is now fixed, ranks now reduce cast time and mana cost of your next three destruction spells by 10%/20%/30%.
    * Empowered Imp has been implemented and now all critical hits done by your imp have a 33%/66%/100% chance to increase your spell critical hit chance for your next spell by 100%, up from a 20%/40%/60% chance.
    * Eternal Flames no longer has a chance to refresh the duration of your immolate on the target.
    * Chaos Bolt is no longer implemented.
 
 
Affliction
 
    * Fel Concentration now gives you a 14%/28%/42%/56%/70% chance to avoid interruption while casting unstable affliction and haunt.
    * Improved Felhunter has been changed, it now gains mana equal to 50%/100% of its shadow bite ability and it increases the effect of the felhunter's fel intellect by 1%/2%.
    * Eradication now only has a chance to increase your spell casting speed on corruption ticks, instead of corruption and unstable affliction ticks.
    * Haunt now increases all damage done by your damage over time effects on the target by 20%, up from 15%.
 
 
Demonology
 
    * Demonic Embrace now just increases your stamina by 2%/4%/6%/8%/10%, independent of your spirit.
    * Demonic Sacrifice now grants you an effect depending on the summoned demon for 30 minutes, instead of just flat out increasing your spell haste and spell damage.
    * Master Demonologist- The felhunter effect has been changed, it now reduces all spell damage taken by 2%/4%/6%/8%/10%, instead of increasing all resistances by 0.2/0.4/0.6/0.8/1.
    * Demonic Empowerment has been implemented and the succubus effect has been changed that once the succubus goes into the improved invisibility state, all stuns and movement imparing effects are removed, in addition, instead of the felhunter effect reseting all  of the cooldowns, it now dispells all magical effects on the felhunter.
    * Love Struck is now Improved Demonic Tactics; it increases your demon's critical strike chance by 10%/20%/30% of your critical strike chance.
    * Demonic Empathy has been changed so that when you or pet hits with a critical strike, the other's damage done by their next 3 spells or abilities is increased by 2%/4%/6%.
    * Metamorphosis no longer restores your health and mana when you switch in and out of the form, however, the duration of stuns and movement impairing effects are reduced by 50%
 
 
Pet changes (Source)
 
    * Felhunter: Paranoia and Tainted Blood have been replaced with Fel Intelligence and Shadow Bite.
    * Shadow Bite (Felhunter): Deals Shadow damage plus additional 5% Shadow damage for each damage over time effect on the target. 6 sec cooldown.
    * Fel Intelligence (Felhunter): Increases total Intellect and Spirit of party and raid members by 3%. Lasts until cancelled.
    * Felguard: Health increased by 10%.
    * Succubus: Health increased by 20%, armor increased 22%.
    * Imp: Health increased 20%, Armor increased 16%, mana regeneration increased 200%.
    * Voidwalker: Health increased by 20%, Damage increased by 16%. The amount of attack power the Voidwalker gains from it's master's spell damage has been increased by 45%.
    * Consume Shadows (Voidwalker): Duration reduced to 6 seconds, and effect increased 66%. Now also greatly increases all nearby allies stealth detection while channeled.
    * Summon Dreadsteed/Felsteed: Mana cost removed, global cooldown removed.
    * Bane now also reduces the cast time of your Haunt spell.
    * Infernal: Cooldown reduced to 15 minutes, down from 1 hour. Duration reduced to 1 minute, down from 5 minutes+. Health increased by 30%, damage increased by 60%, and armor increased 30%.
    * Doomguard: Health increased 20%, mana increased 24%.
    * Avoidance (Felguard) - Now reduces damage taken from area of effect attacks by an additional 80%.
    * Avoidance: Now automatically learned for the Succubus, Imp, Voidwalker and Felhunter at level 10.  
 
 
Warrior
Class changes list in the work, check the updated talent calculator for all the changes