In another case of fine patent database snoopery by Siliconera, it's been discovered that Namco-Bandai is developing an inflatable drum controller for a Wii version of Taiko no Tatsujin. 

The accessory is inflated like a beach ball, and the Wiimote is then stuffed inside like the file your aunt hid in the cake she baked for your uncle Charlie in prison. There's already a Taiko no Tatsujin game on the Wii in Japan, so this could either be a way to save on manufacturing and shipping costs to bring that game stateside, or it could be a new game altogether.

The Wiimote hovers inside of the inflated device, and taps are registered through vibration on either the top or sides of the "drum." I don't know how well that would work out, but it looks like thy're doing it anyway. Personally, I'm just happy to have more Taiko no Tatsujin. Take a look at some diagrams of this thing in the gallery and let us know what you think of it.