What we will see:
-Wii U media blow out. We'll get our first look at the 3D Mario title.
-Pikmin 3 revealed. Will be released at Wii U launch window (not launch).
-New Super Mario Bros Mii will be there for launch, maybe as a pack in game so it doesn't go head to head with NSMB2.
-Wii U Sports (equivalent) will be announced, and if NSMB Mii isn't bundled with the console, this will be.
-Retro's new game revealed. Probably a new IP aimed at the COD audience.
-Zelda 3DS by EAD3 will be revealed. Graphics and gameplay will be similar to OOT 3D.
-No price, no date, no specs. However...
-The console will be slightly more powerful than PS3, while streaming a 480p image to the controller. It will be the Dreamcast to N64 (PS3 and 360).
-We won't be able to transfer our Virtual Console games from the Wii over to Wii U.
-Smash 4 teaser.
-Yoshi game by Good Feel for Wii or 3DS.
-HD Collections/HD Virtual Console games will be announced, starting with Wind Waker/Zelda HD Collection at launch. GC virtual console for Wii U announced.
-The Classic Controller Pro+ will be announced. Available at launch, it will have analog triggers and be required for Gamecube virtual console games. It will also be compatible with Wii U games.
What I'd love to see, but am not holding my breath:
-Retro is working on the next console Zelda title. Last year's tech demo was by them, and the game will be ready next year.
-New F-Zero. Not sure which team will be working on it (Was going to say SEGA, not sure anymore considering their recent problems). Thanks to minimal use of the controller screen, the game will be capable of 60 FPS, 1080p and 30 player online races. As F-Zero was the showcase of SNES' power, F-Zero U will do the same for Wii U
-New name, the box will look different, and the controller will have analog sticks and analog triggers.
-GIGATON: Final Fantasy Versus XIII will be shortened to Final Fantasy XV, and will also be available for Wii U. Final Fantasy XIV 2.0 will see a release on Wii U as well, the same day it ships for PS3.