http://us.battle.net/wow/en/forum/to...1747932?page=1
So reading that, they are increasing damage tank specs will take at all times, and they claim that tank specs already do poor damage; I have found that to be a complete fallacy so far (Yea, its beta I am aware)
This video, around one hour starting, is a rogue/ww (Rank one players) Versus a resto shaman/prot warrior. The warrior doubled the damage of both dps on the other team, while being unkillable for five minutes straight, with two dps on him.
(Note, I am not linking that to promote his stream; I just have no other way to show the video)
http://www.twitch.tv/rzn732/c/4572271
They say they want to make it "Fun" to fight as or against prot classes again; I do not see how that will be possible with how insane "Active mitigation" is to a tank spec, unless they completely neuter it in pvp.