Hunter (getting perma stealth, no dead zone, and a knockback) Warlock (obvious) Mage (obvious, theyve always been OP) - these are going from good to better.
Monk is going from non-existant to existant, with new mechanics no other classes have, so them. Warrior. Non-Feral Druids. Going from mediocre to good.
Retribution pallies(mobility nerfed, with no real compensation), feral druids (bear form/cat form seperation... YES!) are getting nerfed.
Shaman, Death Knight, Rogue, and Priest seem to kinda stay the same.