Virtual reality headset? No way. And it would be lousy anyway.
Most likely? Some sort of promo thing like the Best Buy try e3 games thing.
Decent chance: a late port of a 3rd party title like GTA5.
Moderately possible? The new Zelda. Reggie likes Zelda, the crowd on hand would like Zelda, Reggie's been doing a bit more of the announcements lately, Zelda is a western-focused game, and the timing is about right now that WWHD has been out for a couple months. That would qualify as dropping the bomb.
Unlikely but possible: some new IP that they hope will draw a bunch of attention to Wii U.








