1) They have to sign legal documents saying they can't reveal stuff until it's designated to be revealed.Yeah, I really don't understand the need for the secrecy. Its a game for goodness-sake. Just tell us already.
I think there are alot of folks at WoTC that think of themselves as waaaaayy more important than they really are.![]()
2) GenCon is where announcements are made, so people pay attention to WotC at GenCon. If they reveal it prematurely, it will kill the buzz, and they won't get as much press. It's just more benefitical for WotC to release the info at the major gaming event of the year, then blow their wad two weeks beforehand.