I know we don't have a lot of info yet but, if you look at the blurred Spoilers on the Front Page, it says that the Eye of the Storm is related to the Divine Bell, aka the Bell I think Garrosh was talking about in his Voice Files, and the Thunder King, who's apparently coming back.
They then talk about Illidan.
What does Illidan have to do with the Mogu, or the Pandaren? I'm highly confused. Why're we heading back to the Black Temple with this 'Eye of the Storm'?