When I first saw the Wii U controller, this is what I imagined Nintendo was thinking:
Wii is successful
UDraw is (for SOME reason) successful
WII + UDRAW + TECHNOLOGY = WII U!
Haha... But anyways, then thinking about it, I imagine that Nintendo just wants to ride on the hype of tablet devices like the iPad, and that seemed to be demonstrated with the controller concept video. What do you think?
And that brings me to my second point -
Because the Wii U is backward compatible with all Wii controllers, it has to use Bluetooth (which is utilized by Wii Remotes). It would only make sense from a developer's standpoint to use Bluetooth with the new controller for simplicity. Now - most of you should know that the Wii Remote was exploited for use with PCs right around the Wii's release. Personally, I use GlovePIE to make scripts for all my Wii controllers for use with PC games, and of course Dolphin has Wii remote functionality built in. If the new Wii U controller uses this same tech, then most likely it will be exploited right around its launch as well! Perhaps we could even see alterations on the controllers built-in OS (if there is a built-in OS). Personally, I wouldn't be surprised to hear that someone has modded the controller to function as a makeshift tablet (Android anyone?

Be sure to reply with your thoughts and comments!
-Andrew
'DaManWitDaPlan'