The Wii U Gamepad is not supported. It uses 5GHz WiFi to connect not Bluetooth.
There are some ways to get the Gamepad to work with Windows but probably not to the extent that you are looking for as far as gaming, but you can check out this video I've seen for some info on that. www.youtube.com/watch?v=WCRGNXZlSf8
It has been one of my goals to get the Gamepad to work with Windows and be recognized as a separate display device, but that would take a lot of research and time that I just don't have.