News of a RockBand 3 keyboard surfaced back in June, and today the device made an appearance on the FCC.  As you can see below, the device consists of the keyboard itself, as well as a wireless USB dongle that connects to your console (in this case, the Wii).

A few interesting features of the keyboard (details below) include a touchstrip for producing unique sound effects and overdrive button.  The device also has a 3.5mm overdrive jack and a MIDI out port.

The RockBand 3 set is scheduled for release in October this year.