I suppose that it's possible that both of the new dungeons will be directly related to the MSQ's this time around. 3.4 and 3.5 are - presumably - the patches separating us from 4.0 so chances are the story is going to become very fast paced and answer a lot of questions. A lot of people also expected the next 'Hard' dungeon to be Snowcloak so the fact that it isn't and is instead Gubal could be very telling.