Reggie just has to spin whatever they decide to show. He knows about the other games in development, probably a Kid Icarus Retro game, whatever the Mario and Zelda teams are making, among other stuff but can't say. Hell, they won't even show the Mario Baseball, Wario, and Kirby games on the floor they already have announced and shown screens of.
I don't think they want any focus at all on their own actual games at E3. Especially with third party people bitching all the time Nintendo steals all the spotlight. Well, there you go companies, hardly any Nintendo games on the floor to worry about competing with for the spotlight.