"A new trademark filed by Nintendo indicates the DSi SD card slot might be used for more than just DLC storage.

The Japanese trademark is for a “DS Houi Sensor Card”. Houi is Japanese for “direction,” and Siliconera is speculating it could be for a motion-sensing SD card.

After last year’s Slide Mag Kid, the news is hardly a surprise, and is also perfectly in line with the company’s stated goal of expanding the way people interact with their video games. Either that, or there are going to be people swinging Wii consoles around their living rooms in the near future."

Looks like we may be using the DSi as a backup Wiimote with this stuff.