From the trailer, it says that Medivh will return. This has pretty big implication for the story going forward.
No instagram integration and no new selfie filters that drop from LFR only
Who is that human?
I'm so hyped! That video hyped me up so much, I am believing in blizzard this time.
The "Master" could be Khadgar, remember in the pre-patch quest he said he would be "Remiss" if he didn't bolster Karazhan's defenses before he left. Also I would assume the final boss the be Thal'zar or whatever his name was who raided the place during said quest. My prediction at least.
http://i.imgur.com/q5Fb734.jpg - Ion said no content drought, then no content drought.
Medan is finally returning (since he's the guardian now)
Never mind the first sentence, just watched the trailer again.