The recently-released February issue of Electronic Gaming Monthly reports that Nintendo plans on releasing "100 Marios*" in the second half of this year. Apparently, it was only planned as a technical demo for SpaceWorld, but fans loved it, and Miyamoto's hard at work into turning it into a full-length game. The title is currently a provisional name, and will most likely change before release. EGM is also saying that a trailer and playable demo of the game will both be at the upcoming Electronic Entertainment Expo (E3) in May! Nintendo has yet to confirm any of this.
EGM is also saying that a direct sequel to last year's hit The Legend of Zelda: The Wind Waker will be out during the second half of this year. Nintendo plans to have this game at E3 as well; a trailer will definitely be available and a playable demo will most likely be available. This year's E3 will definitiely turn out to be one of the best gaming conventions ever.
*I can only guess that this is Mario 128.