Apparently some hackers called Chaos Computer Club reverse engineered the Wii U gamepad to use with the PC.
Kinda cool especially when you're going to be able to use it with the dolphin emulator to play some of the new Wii U games.
Atleast heres a video of their little conference
http://www.youtube.com/watch?v=m8YgVVtNRjg&feature=youtu.be