Here are some major points:
Alliance will have a incompitent commander in a war and the player may have to take over for them.
Sylvanas will have a major role to play in the ousting of Garrosh.
The blood elves will have a major role in the upcoming patches (5.1+)
THERE WERE MANY OLD GODS KILLED BY THE TITANS ON AZEROTH!?!!?
I haven't listened to it all, but I'll put up more info if I find any.