Originally Posted by
Nodata
Honestly, the new mechanic that gets the less press is probably Detox (the remove all bleeds from target), but it may be one of the most environment-defining spells of MoP.
Think about it this way: in a single global, in negates at least half the pressure of an entire opening chain from a feral or a rogue, effectively making monks a hard counter to those two classes/specs. If monks are any good (which they should be, after all many people will roll them and Blizzard wants to keep people happy with them), then their presence in the arena is going to mean hell for rogues and ferals. Literally.
By extension, what are the classes that suffer the most from rogues but are otherwise quite strong in the field?
Death Knights.
If you're happy playing one at the moment, I would stick to it, they are going beast mode with desecrated ground (2nd pvp trinket at lvl 90).