A new job listing at Japan's E-Career recruiting site makes mention of the start of a new Wii project. And the poster of the job listing? None other than Media Vision, creators of Sony's Wild Arms series.
According to the listing, Media Vision is seeking programmers for both the start of a new Wii project and for general mobile game development. The site doesn't provide any information on the new Wii game, but it does make heavy mention of the developer's success with the Wild Arms series, along with the fact that the female staff held a Valentines event where staff members played bingo to win chocolate sake and tofu.
Here are some videos for Wild Arms. Can you embed videos here because I tried and failed.