From my experience currently casting classes do excessive damage at the moment, aside from necro dots, demonologists in pvp gear now are substantailly harder to kill and deal the same damage as when they wore T4, in alot of minis i have noticed that the team wont even risk pushing when there is a demo on the other side of the room spellweaving because they can cripple the entire team in a matter of seconds when combined with some ranger focus and necro dots.
It also seems to me that rangers are hitting even harder now, a pvp10 ranger taking out my barb which totes 32.6% pvp armour with just bleeding puncture - pen shot - quick shot and TTS. Luckily i got my revenge though by inserting my highlords sword into his rear end several times.