On the front page there's a soundfile of Wrathion.
From about 7.20 or so he's talking about the heart of the Thunder King, filled with the magic of the Titans.
He has a vision of the universe and see's millions of worlds with one standing out, presumably Azeroth.
Then something interesting happens, he gets "possessed" by someone or something and says "We have fallen, we must rebuild the final Titan"
Speculation? Was it a Titan on another world?
I'm really thinking the Burning Legion have defeated the Titans now and that's where we're heading in the next Expansion, to what ever planet that voice came from!