just calling this early. As nice as its been to see Garrosh butt heads with Lor'themar and Baine and Vol'jin, no leader has held TRUE contempt for the guy like Sylvanas. not because of ethics or anything, but because Garrosh is simply too unsubtle and stupid.
Considering they're both villains at this point, Sylvanas/Forsaken turning against Garrosh will be an amazing plot. Lor'themar, Vol'jin and Baine all have very good and 'heroic' reasons to want Garrosh gone, rooted in concern for their people and the Horde (or just his people in lor'themar's case, but whatevs) but Sylvanas is different. this is evil vs evil, and that has potential to be cool and refreshing.
How they handle this story could make or break it as the best conflict of MoP.