I mentioned banning some op PVP skills, so all those cheat death skills could be banned. But i still don't think that's gonna be a problem because you could only get matched vs the same class that you are currently playing so you would have all the cheat death spells if you wanted and still not be any better/more powerful than the other player because they would have all the same passives as you (of course everybody would choose their own spells but cmon, who wouldn't take the cheat death ones?).
And you already solved the problem with toughness: huge dmg resistance for everyone and all CC durations reduced.
I don't think that special gear would be made for PVP but you would need to use different builds of course which is nothing new - speedfarming and gr pushing builds. Now instead of 2 possible builds for every character you could choose between 3 - 2 of those would be for farming in this case (speedfarm and PVP) which would only bring more build diversity who everyone was crying about - you could focus to normal rift farming or to farming through PVP, now if I'm not mistaken this would be first free choice for builds in D3.