Just read this on MMO champion.

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Q u o t e:
Defensive Stance now increases threat by 125%, up from 100%.

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So they bumped it to 100% and now they are bumping it again to 125%? With all that increased threat I'm worried prot warriors are going back to the days of doing crappy actual damage.

This is not a warrior nerf and has nothing to do with Vengeance. We buffed the threat done by all four tanks because players were having too many threat issues very early in fights. It's one thing to ask the mage not to Arcane Blast until the tank gets a hit or two on the boss. It's another if the dps are all sitting around for several seconds waiting for the fight to begin.

When we removed the passive threat reduction from say Battle Stance and rogues and paladin healing, that left tank threat slightly below where it had been. We suspected we would need to bring it up but just didn't have good estimates yet for how high it would need to go up.