none of the above. it will probably just be confirmation of more download content (eg. game boy, game boy color and gameboy advance titles) available via nintendo's store for play on the DSi along with a slew of DSiware applications and widgets.
Definitely not Zelda or Mario, that's for sure.
Has to be movie streaming. It just has to be! Since the Nintendo Channel doesn't amount to anything at all....
Obviously some DSi exclusive game
Hoping for a US release date of the New Play Control! Metroid: Prime games.
I hope Nintendo will present something great for Core-Gamers. Additional to that something new on MotionPlus and Wii Sports Resort, a storage solution and a big big surprise. Hope so!