As a guy who has played guitar off and on for about 15 years, gaining a modicum of talent along the way, I'm really excited about this. I was in the market for a new electric guitar, I'd gladly buy one that could interact with a Rock Band game. Talk about the ultimate practice partner. Hopefully they allow for the guitar to function 100% on master mode, if I could play with the fingerings on the screen that would be a great tool for me personally.
I'm psyched about the keyboard too. Glad to see these games slant into a more realistic direction. I think it will be good for music in the long run.
Hope to get a Pink Floyd game at some point, that would be a natural for these new instruments.