Continuation of the spoilered convo:
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I really don't want Thrall back as warchief partly because I would have to stay away from Gen. Discussion for days lol and partly because as Karoht said, he has a lot on his plate. I am glad to know that he may not be back as a the warchief.
Also you do have a point in not worrying about who is going to be the new leader of the Horde until we get to the point of removing Garrosh from the position. I find it interesting that they did not say kill. This could make an impact on the actual raid, simliar to HM Reg. We face Garrosh, and then the last phase only in HM would be some form of the Sha. That can help remove some of the "casual" QQ that is common.
About the bosses, I kinda like the fact that we don't have any major Lore villains so far in MoP. Its a new world with its own set of problems and soon a whole new set of problems with us in it :p.
Granted, you can only pull the whole untouched place card once maby twice so they need to go back to people who we need to have some kind of inkling of like the ones Ivellius listed.
Although as much as people would like to kill her, I don't think Sylvanas is going to ever be a boss. The only real prove is my gut feeling, but she could have been dead...3 times over? If the Horde doesn't care enough to eliminate her for raising the Forsaken then I don't think she is going to push the envelope.