I will wait for the next gen. SInce WIi U is not a next gen, probably not gonna buy.
I will wait and see the games that will be released on it. Nintendo have tendencies to realease the same game over and over and over. Zelda hasnt evolved except for motion controls which I hate. Mario too. The series that evolved like Metroid are not from Nintendo anymore, they are made by other studios.
Anyway, so far I just think Wii U is a gimmick machine like the Wii was and after the next gen are here, developpers wont really develop and port their games to the wii u, exactly like the wii.
Not anytime soon. I played it recently at GameStop and wasn't impressed. The only demo available was Rayman. In my opinion there really needs to be an attraction to buy something that I already have a better version of (PS3), and so far that gamepad isn't it.