Warrior - # You now gain rage when damage done to you is absorbed, such as through a Power Word: Shield. (Meh)
Changing stances now has a much reduced cost: you lose a maximum of 20 rage (10 with Tactical Mastery). (About time!)
Warlock - Additional new talents have been added. (Get ready to respec...)
Several other warlock talents have had their ranks reduced, their effects changed or removed. This list includes but is not limited to Demonic Empathy, Shadow Embrace, Eradication, Suppression, and Pandemic.
Shaman - Chain Lightning – now jumps to 4 targets but does less damage.
Totem streamlining: The Mana Spring and Healing Stream Totems have been combined. The Disease Cleansing and Poison Cleansing Totems have been combined. (Again, about time.)
Mage - We are also working on making Spirit a more useful and interesting stat for all mages. (HA! See final part of post for why this makes me laugh.)
Paladin - Blessing of Kings – this spell is now a base ability trainable by all paladins.
Exorcism – this spell now causes damage to all types of enemy targets. However, it always critical strikes undead or demon targets.
Hunter - Consumable ammunition has been removed from the game. Arrows and bullets no longer stack, but are not consumed. Ranged attack speed bonus gained from quivers and ammo bags will be preserved in a different capacity. (Yay, but huh!?! Can't wait to see how this is done.)
Death Knight - Unbreakable Armor now absorbs a flat amount of damage that increases as your armor increases. It no longer boosts armor. (I can hear the screaming now.)
MANA CHANGES -
Regeneration while not casting (outside of the “five second rule”) will be decreased. We think that (1) the ability to cast heal over time spells and then sit back and (2) benefitting from a clearcasting proc that also gets you out of the five second rule both provide too much mana regeneration, even over short time periods.
To make this change, we are reducing mana regeneration granted by Spirit across the board.
See Mana Regen Changes for the full Blue post.