I foresee a lot of weapon swapping, or deadly brew being mandatory in pvp.
I was really hoping not too see cookie cutter pvp spec's again as cippling will always be mandatory in pvp, at least in my opinion.
Since poisons will be aura-like in Mists, weapon swapping won't help. You'll have to cast a new poison whenever you want to use it. Otherwise, yeah, it would've been hardcore. Like T9/T10 x1000.