http://kotaku.com/5547072/rock-band-3-is-the-piano-man
Unless Harmonix is just trolling everybody by sticking a piano/keyboard icon in with the 4 "regular" Rock Band instrument icons it looks like Rock Band 3 will further explore the music simulator genre by putting a piano in there. Over in Japan, Konami has already explored this realm with their arcade game series KeyboardMania; they licensed their patents to Activision for Guitar Hero and we all know how well that went over, I'm interested in seeing how this pans out.
And I also need to find a new instrument to make fun of.
How about Tambourine Hero?