I actually think nintendo's desire to have a press announcment with AHA today is to free up time at E3. We will get Vitality details today and some more publicity at E3, but it will be a quick mention. I can see a whole hr devoted to 3DS and perhaps even a new Wii iteration... thiner and some added features (probably social features ie Facebook).
The knowns are Zelda, Metroid, Other M, Golden Sun, Wii Party, and VS game. The unknowns will be the suprises. We could get info on retro's and sora's projects.