Casters will be amazing in mop. Melee are alright, however with the 8 sec dispel cd, I cant see mutiple melee being that great even when they have mutiple escapes. The simple fact that a resto druid can give a priest cyclone along with their new fear toy is stupid. Mages are out of this world good for pvp in all facets, their only counter are hunters and good dks. While warlocks are decent that blood fear is beyond annoying and while sure everyone has fear counters they dont have them every 10 secs and you basically have to kill them twice within a short time period because their heal is really good.

Mage/Spriest/druid - Mage/Lock/Druid will be the top teams no doubt