Heh, we were right to assume on the origonal Best Buy E3 thread that there would be four demos. ^_^
Ideally, I'd want Mario Kart, Pikmin 3, SSB, and Sonic, but that's probably too good to be true, namely Smash Bros. I'd like to think that the reason they haven't told us which games will be demoed yet is because they're seeing if they can get the SSB demos ready in time, but that's uber unlikely as the demos must be ready by now. Heck best buy may even have them already. The real reason is more likely because they haven't yet announced some of the games to be demo'ed.
So my more logical guess: Mario Kart, Mario Platformer, Sonic, Pikmin 3.
Basically the same as Roma hehe. I'll be really disappointed if they demo WW HD since if I wanted to demo that game I'd just buy the gamecube version. Regardless, they'll all be fun games, and it will be interesting to see who's predictions come true. ;D