I'm sure this kind of thing has been said already, but just throwing in my opinion:
I think Wii U (hopefully with a cool rename but let's not get ahead of ourselves) has huge, huge potential. If they bring out their full first party lineup to support it, it'll do great. We already know Pikmin 3 is coming, and obviously Mario and Zelda, Metroid and Donkey Kong etc, but it's how they handle the other franchises that interests me. F-Zero, Kid Icarus (hopefully KI stays alive), maybe revivals of Ice Climbers or Earthbound/Mother, etc. They have enough franchises to spread out across the different game genres and really hit a ton of different audiences.
Not to mention the Smash Bros/Mario Kart/Mario Party trio. While its important to Nintendo to continue to be creative or innovative or whatever, they also need to retain the classic feel, which is more in the case of Kart and Party. There needs to be some kind of classic controller to use for these games too. Just modify the Wavebird to work with the same signal that the tablet controller uses. I don't want to lose the 4 friends on a couch just playing thing. People still use N64's just for old school Party/Kart/Smash, there's no reason Nintendo shouldn't be able to drag most of these people to the new console.
I just want Wii U to realize its potential. :/
edit: It's also intriguing how Wii U could finally bring MMO and RTS games into the console space. That, I think is the potential of the tablet controller, none of this other nonsense I saw at E3 last year like throwing ninja stars.