Two of the paragraphs that were originally posted below have appeared on GoNintendo before. They have been removed, but the post below is indeed a new rumor.

Ahh you gotta love rumors. This was posted over at Game Asylum:

Ubisoft's Japan-developed GT Pro Series - which may or may not be a Wii launch title, depending on where you get your information from - will come with an attachment of some sort that will make it a 'must-have'. We're guessing a clip-on steering wheel. Developed by the people behind the GT Advance series, the game will include over 80 licensed vehicles.

Thanks to PasstheWiimote for the heads up.
Now let the speculation begin!