so currently blizzard has established a 3rd developing team. the official website was redirected for 2, or more, days to a site with a 403 error, just like the WotlK was redirected to exactly the same sort of site a little week before the announcement about it was released.
furthermore, games convention is being hold the 23-26th of august, but i guess we will have to wait and see.
article about the secret coding team known as team3
Gamasutra - E3 Exclusive: Blizzard Establishes Third Team, New Game Expected