Harmonix hasn't been dishing out a ton of Rock Band 3 details lately apart from confirming that it'll be out this holiday season, but it just revealed a big one in the demo for Green Day: Rock Band. If that not so subtle teaser above is any indication, it looks like Rock Band 3 will be adding keyboards to the equation. Nothing more to go on than that at the moment, but we can only assume this also means that Activision will soon be hard at work on Keytar Hero, and that "Axel F" will be stuck in your head starting right.... now.