Confirmed 1.9 Patch Notes

[vor_lord]

So talent stuns got a huge boost.  Improved Revenge is now very good in the pre-raid world again becuase it won't turn the mob immune or make that conc blow you want to do too short, I see a use for it in PvP as well.  Paladins can be stun machines (seal of justice was more than a 5% proc rate for me it was more like 25%).  Mace rogues are going to be something else to consider in PvP with them stunning like they can.  Mace warriors are going to something to consider in PvP as well.  I'm not sure people remember how much some of these talents can stun and the fact that they no longer diminish or become diminished is a pretty big change.  A prot warrior with improved revenge should have mobs stunned most of the time now between it and conc blow.  Since mobs in ZG are not stun immune I'm really going to have to reconsider this talent.  I used to really like it until the diminishing returns change and all the other classes have stuns of that nature just made mobs immune too fast.
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I do not think diminishing returns on these skills are gone. The "controlled" stuns now no longer apply, which really is a nice buff. My expectation is that now I can use Seal of Justice until they go immune to further Seal of Justice stuns, but still have my Hammer of Justice available.

Improved Seal of Justice seems like it would be mighty useful in PvP now. Sure all it does is front load your stuns but that's when you need them.

I would not expect a prot warrior to be able to chain stun using improved revenge. I would expect him/her to be able to stun as much as possible without interfering with the controlled stuns such as Kidney Shot, Hammer of Justice, and Concussion Blow.

But that is just how I'm reading the text, so take that for what it is worth :P