I got trapped inside an intrinsic field test chamber today. Now that I've pieced myself back together after being disintegrated, I have future sight and bring good news of a new F-Zero on WiiU.
It will come with a special controller add-on -- a Wii Wheel-like shell that houses a Wii Remote Plus. It's rectangular in shape. It has panels on the back of the left side and right side that act as triggers for cornering left and right. Since your fingers are back there when holding the controller, it's intuitive to "clamp down" on those panels to drift in that direction. Beyond that you're steering with motion control, but there is support for classic controls on the GamePad, Pro Controller, and even the GCN adapter.
Now then, I think I'll return to my glass sanctuary on Mars. *teleports*