I haven't kept up with a lot of the classes, but off the top of my head:
Druids:
Gift of the Earthmother
Crazy AoE damage and healing shit
Berserk
Hunters:
Vanish/CLoS thing
Targetable reverse pain suppression against melee opponents
Pallies:
Ret pallies can now dump absolutely stupid damage into a single target (upwards of 10k in 1 hit)
Tanking changes
Priests:
Another PS like thing
More instants
Shadow priests get a self-healing uber PS
Rogues:
LOL nothing has changed... enrage, stabby spree, free CPs for friendly crits on target, shadow dance
Shammies:
Another mana regen
Spirit link
Tidal healing
Spirit wolf shift removing snares
Roots on shocks
AOE knock back
Oh, and a vanish/clos thing too
Locks:
Everlasting affliction/Haunt (haha ... seriously?)
Metamorphosis remains to be seen, but has potential to be LOL, and gives locks a serious ++ against melee opponents
Chaos Bolt... long cooldown but it goes through everything, so now you can drop through PS, etc.
Warriors and Mages ATM are
compared to that. I don't know what mages have gotten, but the only noteworthy things for warriors are an extra second on intercept stun and strength of arms (wooo 5% str!... in our 2nd to last tier ... YUSSSS). They're increasing our bleed damage but only on white crits, which doesn't mean shit, because our bleeds are constantly reset anyway with new crits. I can't wait for an extra fucking 35 damage on deep wounds when a druid runs away from me.