i am most specifically wondering about anyone who has had level 90 experience in the MOP beta who can talk about which melee and which ranged specs are strong... particularly focused on pvp.

for melee i have been interested in ret, dk, and warrior.
for ranged i have been interested in lock, mage, and priest.

i assume that lock and mage will be ahead of priest and that if need be healing on hybrids will be nerfed. i assume that at 90 dk and warrior out perform the ret?