My main hope for this raid is that they have us assaulting the city while Garrosh is away. This is because I just can't envision Garrosh hiding behind anything. Basically, we go about taking Orgrimmar while he's off doing something, then by the end he finally shows up and we fight him.
Doesn't that fit better with his character's up-front, I'm going to deal with you myself attitude? I believe so.