Siliconera have spotted Kinect Fun Labs - Air Band on the German USK Rating site. The upcoming gadget is almost certainly the already-announced Music In Motion, the gadget from Relentless Software which sees players form, well, an air band.
Although there is no official announcement of the gadget, it's unlikely that two "air band" titles would be scheduled to hit the Fun Labs so close together, so we can assume that Air Band and Music In Motion are one and the same.
We'll let you know as soon as any official news is revealed. Until then, check out some footage of Music In Motion curiously uploaded to Relentless Software's YouTube channel today.