The only changes i want are a few quality of life changes such as flight path chaining. When it comes to spec viability keep it like it was. All specs could find their own enjoyment and every class had a role they could do in raids. You didn't even need to be good outside Tanking and a few key players the rest could be carried. I remember raids with boomkins,dps shamans ect. You couldn't have that many but you can carry a good number of dps. Granted i played and likely would play a warrior again so class balance was always fine for me lol. I could dps good in raids as fury or tank. When it comes to PVP go arms and smash faces.
Edit: They better not remove the "exploit" that allows you to wall jump into Hyjal. I fully plan to do that once 60 for old times sake.