Death Knight
Blood
 
    * Will of the Necropolis now increases your expertise by 3/6/9 instead of 4/8/12
    * Blood Gorged now only affects melee damage
    * Frost Aura increases your Frost Resistance by 32/65 instead of 22/45.
 
 
Unholy
 
    * Corpse Explosion base damage has been changed from 60 to 216.
    * Improved Corpse Explosion now casts a disease on enemy target that deals 36% of the explosion damage over 15 seconds instead of 9 seconds.
    * Unholy Aura increases your Shadow Resistance by 32/65 instead of 22/45.
 
 
Druid
Balance
 
    * Moonkin Form mana cost has been changed from 22% base mana to 538 mana.
    * Typhoon mana cost has been increased from 475 to 645 and the range changed from 20 to 24 Yards.
    * Force of Nature mana cost has been changed from 12% base mana to 284 mana. Cooldown has been reduced from 3 to 2 minutes.
    * Starfall mana cost has been increased from 655 to 866. Range increased from 30 to 36 yards. Damage seems to be changed as well but it looks like unlike other class spells, the version displayed in the talent calculator isn't the first rank of the spell.  
 
 
Feral
 
    * Faerie Fire range has been increased from 30 to 36 yards.
    * Primal Tenacity now increases your chance to resist Stun and Fear mechanics by 5/10/15% (Old version : Reduces the duration of Fear effects by 5/10/15% and reduces all damage taken while stunned by 5/10/15%)
    * Improved Mangle now reduces the cooldown of your Mangle (Bear) ability by 7% (instead of 0.5 sec) and reduces the energy cost of your Mangle (Cat) ability by 2.
 
 
Restoration
 
    * Tree of Life mana cost reduced from 28% base mana to 978 mana.
    * Flourish mana cost decreased from 585 to 450. Amount of healing decreased (Rank 1 now heals 672 HP instead of 1610).
 
 
Hunter
Survival
 
    * Hunting Party now gives your critical shots a 20/30/40/50/60% chance to restore 2% mana, 10 energy, 4 rage, or 10 runic power to all member of your party. (Old version : 20/40/60/80/100% chance)
    * Potent Venom now increases the amount of damage done to targets afflicted by your Wyvern or Serpent Sting by 1% regardless of the rank. (Old version : Increased the damage by 1% for each rank, up to 3%)
 
 
Mage
Arcane
 
    * Arcane Impact is now called Spell Impact and increases the critical strike chance of Arcane Explosion, Arcane Blast, Blast Wave, Fire Blast, Ice Lance, and Cone of Cold by 2/4/6% (Old version : Was only affecting Arcane Explosion / Arcane Blast)
    * New Talent - Student of the Mind (Tier 3) - Increases your total spirit by 4/8/12%
    * Arcane Potency now requires 1 Point in Presence of Mind instead of 5 points in Arcane Concentration
    * Potent Spirit has been removed
    * New Talent - Arcane Flows (Tier 8, requires 1 point in Arcane Power) - Reduces the cooldown of your Presence of Mind, Arcane Power, and Invisibility spells by 30 secs.
    * Netherwind Presence now increases your spell haste by 2/4/6% (Old version : Gives your Arcane Missiles, Arcane Barrage, Arcane Blast, Fireball, Frostbolt, and Forstfire Bolt spells a 1/2/3/4/5% chance to cause the next Arcane Blast, Fireball, Frostbolt or Frostfire Bolt to be instant.)
 
 
Frost
 
    * Arctic Reach doesn't influence Ice Lance anymore
 
 
Paladin
Holy
 
    * The amount of health point healed by Holy Shock has been increased by 66%. (eg. Rank 7 now heals for 2401-2599 instead of 1431-1549)
    * Infusion of Light now reduces the cast time of your next Holy Light spell by 1.3/2.5 secs instead of 1.25/2.5 secs.
 
 
Protection
 
    * Holy Shield will now give you 6 charges instead of 4.
    * Avenger's Shield mana cost reduced by 70%, damage has been reduced. (eg. Rank 3 now deals 494-602 damage for 780 mana instead of 705-861 for 1745 mana)
    * Guarded by the Light now reduces the mana cost of your Consecration, Holy Wrath and Avenger's Shield by 15/30% (Old version : Whenever your parry or dodge an attack you have a 10% chance to reduce the mana cost of your next Consecration, Holy Wrath, or Avenger's Shield spell by 25%/50%)
 
 
Retribution
 
    * Improved Blessing of Might now increases the attack power bonus of your Blessing of Might by 10/20/30/40/50% instead of 4/8/12/16/20%
    * Vindication now has a chance to reduce the target's attributes by 10/20% for 15 seconds. (Old version : 5/10% reduction)
    * Pursuit of Justice is now a 2 rank talents (was 3), reducing the change to be hit by spells by 1/2% and mounted movement speed by 9/15% (Old version : 1/2/3% hit and 5/10/15% mounted speed)
    * Repentance now costs 395 mana instead of 9% of base mana.
 
 
Rogue
Subtlety
 
    * Fixed a typo in Honor Amongst Thieves, now gives a 10/20/30% to gain a combo point when you or someone in your group critically hits with a damage, healing, or spell ability. (Was ... 100/200/300%)
 
 
Shaman
Elemental
 
    * Convection (Tier 1) is now a 3 points talent, reducing the mana cost of Shock, Lightning Bolt, Chain Lightning, Thunder and Lava Burst spells by 4%/8%/12% (Old version : 5 points and 2/4/6/8/10%)
    * Concussion doesn't affect Lava Burst and Thunderstorm anymore.
    * Storm Reach now also increases the radius of your Thunderstorm spell by 10% along with the range improvement on Lightning Bolt / Chain Lightning.
    * Elemental precision increases your chance to hit with Fire, Frost, and Nature spells by 2/4/6% and reduces the threat caused by these spells by 4/7/10% (Old version : 1/2/3% hit and 10/20/30% threat)
    * Astral Shift now has a 33/66/100% chance to shift into the Astral Plane reducing all damage taken by 30% (Old version : 100% chance to reduce all damage taken by 10%/20%/30%)
    * Thunderstorm range increased from 10 to 12 yards, damage increased from 595-679 to 640-729, knockback stays 20 yards.  
 
 
Enhancement
 
    * Improved shields now increases the amount of Mana Shield orbs by 10% instead of 5%, improvements to Lightning Shield and Earth Shield stay the same.
    * Shamanistic Rage now gives your successful melee attacks a chance to regenerate mana equal to 15% of your attack power. (Old version : mana regeneration equal to 30% of your attack power)
    * Maelstrom Weapon now reduces the casting time of any spell by 4/8/12/16/20% when you critically hit with a melee weapon. (Old version : was only affecting Lightning Bolt, Chain Lightning, and Lava Burst)
    * Feral Spirit now lasts 45 seconds instead of 30 seconds.  
 
 
Restoration
 
    * Nature's Guardian cooldown has been changed from 8 to 5 seconds.
    * Spirit Link now also breaks if a shared damage would reduce a target's health below 20%.  
 
 
Warrior
Arms
 
    * Bloodletting has been renamed to Improved Rend once again and doesn't increase the amount of damage caused by Bloodbath anymore.
    * Fixed a typo in Second Wind, Stun or Immobilize effects generate 10/20 rage. (Old version ... 100/200 ^^)
 
 
Protection
 
    * Shield Specialization now gives you a chance to generate 1 rage when a block occurs. (Old version : 2 Rage)
 
 
Warlock
Affliction
 
    * Death's Embrace (Tier 9) does not affect Shadowburn anymore. Haunt has replaced Shadowburn here.
    * Haunt (Tier 11) has been changed from a 10 sec cooldown to a 15 sec cooldown.
 
 
Demonology
 
    * Soul Link (Tier 3) is not required for Unholy Power anymore.
    * Master Demonologist (Tier 6) is no longer required to take Demonic Empowerment (Tier 7)
 
 
Destruction
 
    * Aftermath (Tier 2) changed to 2%/4% chance to daze the target for 5 sec. (Previously 5/10% for 5 sec)
    * Chaos Bolt (Tier 11) changed to an 8 sec cooldown. (Previously 12 secs)

Backdraft is currently incredibly powerful. I'm speced 60 into destruction in beta atm.
 
My normal incinerate cast is 1.95 secs. Casting a conflag gives me 3 incinerates at .65 seconds.
 
My chaos bolt also hits harder than my incinerate, base.

Also, doing the math on Imp Soul Leech, it too is overpowered as all hell. A sunwell geared Warlock will literally never run OOM and never need to Lifetap. It translates into 9% of your DPS becomes mana regen per second. With 2200 DPS it'll return 198 mana per second. With a 2.0s Shadowbolt (300ish haste) you only consume 199.5 mana per second. Even with a Shadowbolt now costing 715 mana, DPS will go up and we also have Fel Armour regeneration.