New Rock Band 2 Instrument Coming (??)

Could it be the flugelhorn?

Official XBOX Magazine found that the orange input on the Rock Band 2 drum set is not an input for a second kick pedal as was previously thought. Harmonix have yet to release information about the functionality of the input but state that the functionality, and details for double-kick will be revealed.

This could be the final unveiling of the rumored and much anticipated keyboard or just another drum set accessory.