"Foundations of Interactive Game Design" class on May 26, though the panel is open to the public. The discussion is being moderated by associate professor Noah Wardrip-Fruin.
As for what's being discussed, your guess is as good as ours. Hecker describes it as "an open panel discussion" and notes that his game SpyParty unfortunately won't be on-hand for attendees. Blow separately confirmed to us that he doesn't plan on having his studio's next game, The Witness, at the event either. Bit.Trip series co-developer Alex Neuse didn't get back to us before this post was run, but it stands to reason that his next game, Laserlife, won't make an appearance either.
That isn't to say you should miss the talk, which will assuredly be thought provoking. And hey, if you're that worried about getting a chance to play SpyParty, why not sign up for the beta? That worked out pretty well with you and Minecraft, right?