I swear I called this over a year ago, though I'll bet you called it too. The one I wasn't expecting? LEGO Indiana Jones. Still, LEGO Batman: The Videogame? Come on, how cool is that?
Okay, so it's a tease in the worst way, i.e. it shows nothing of consequence including what appears to be any part of the actual game engine. Then again, Warner Bros. just picked up LEGO Star Wars and LEGO Indiana Jones developer Traveller's Tales, so perhaps it'll get fast tracked and actually make its fall 2008 release date, following the release of The Dark Knight in mid-July.
