We're not sure if this info is true or simply a mistranslation, but info escaping from a GDC presentation with Nintendo's Takao Sawano suggests that the company may be developing some type of boarding (we assume snowboarding) title set to make use of the Balance Board premiering with Wii Fit.
Sawano, who was instrumental in the development of the forthcoming Wii Fit, revealed that Shigeru Miyamoto wanted to the board to be a wide rectangular shape rather than square. The reasoning behind this is that most people line up their shoulders when performing many exercises. He further said that the design choice ended up being the correct one, as it turned out working great for their snowboarding title.
Again, we cannot confirm this information but we clearly heard mention of a boarding game by Sawano during the presentation. We've got a full interview planned for tomorrow, so we'll be sure to ask Nintendo about this then.