So they made a post on their facebook here https://www.facebook.com/Warcraft?hc_location=stream
EDIT- They posted;
"Wrathion foresees a rising menace that not even the Horde and Alliance together may be strong enough to overcome. Like if you think Wrathion has Azeroth’s best interests at heart, Share if you think he’s hiding something. http://bit.ly/11Z9z0Z"
Wouldn't surprise me if we get information released before Blizzcon, as they wanted to speed up the expansion cycles.