We'll just have to wait and see what it is. The guy said that it's a "solid clue of things set in motion." Basically, what this means to me, is that he's going to tell us something that pretty difinitively states that Diablo 3 is in the process of being made.

Then again, I'm not getting my hopes up. There have been too many times when everyone thought Diablo 3 was coming out and it never did.