Activision has launched the Band Hero website, with a contest containing prizes include a console Band Hero bundle and a DS Band Hero bundle.
Seems like the Band Hero DS Lite Band Kit includes the Guitar Grip peripheral and a "drum skin" peripheral, which was unknown before.
Don't know if this means you can tap a drumbeat with your fingers or if you would use plastic sticks to beat on the DS as it sits in your lap.
Still, drumming and beating on stuff is fun.
More over on Joystiq.