I am on the PTR and nothing is different, arcane takes more work to do the high dps and locks are right there also. They have nerfed arcane but are giving some of the buffs back because it was a lot of nerfs at once. Locks are still high and i see the occasional rogue but no warriors, the occasional dk, but to make the fights hard for both would consume the whole area around the boss. As it stands now if you bring in enough range you can do better, amd i think that is blizzs way of helping guilds. If they made it so melee are better, they would just sit on the boss and tunnel like they get to do most of the time now since range can do things more effieciently. A range can hit something far away while a melee has to run there.
They're still doing number tuning. Affliction will get its nerfs.