Originally Posted by
Wishblade
I highly doubt we'll see anything beyond further details of the preview material.
The reveal ceremony will be:
The full 7.3 trailer.
Spotlight on Kel'thuzad in Heroes, and probably show off the 3 skins.
Actual preview of the Fireside Lich King fight in Hearthstone.
More details on Junkertown and the animated short.
And more info on Dehaka.
Expansion reveal will wait till BlizzCon, 7.3.5 and raid will happen a few weeks later, Alpha/Beta testing of expansion begins soon after and expansion next Summer.
That's my estimate at least. Now to cool down the system now that Gamescom's reveals are basically done for me except for the full trailer.