http://lethalbunny.com/wp-forum/blog.php/2010/05/25/greenday-rock-band-demo-live-keyboards-teased-for-rb3/
^ Self plug. Anyway, the Greenday Rock Band demo has teased keyboards for Rock Band 3. Now, I, as a massive RB fan, am stoked by this. Hopefully it means I can jam along to Dream Theater, Journey and all that good stuff on keyboard. I'm interested to see how this affects the cost of Rock Band 3's inevitable instrument pack, as well as how they manage to fit the keyboard note track onto what is an already pretty full screen when all the instruments are in use.
I guess we'll have to wait and see. Bring on E3, I guess.