Hi, I just wanted to give an hint about "how to leak" without too much speculation.
Not sure this way will actually work, but the days closer to the Blizzcon will maybe allow this method:
actually existing products of Blizzard related to WoW have their following URLs.
I mean, by simpling editing the URL with a possible acronym or word that may reefer to the title of the next expansion, we will be probably able to find the "under-development" website of the next expansion.
I'm now waiting for rude comments, thanks all anyway.