Edit: Dead link
Take a look at this.
Someone took pictures of the game informer mag and posted them on the site. Looks like Guitar Hero will be also Drum Hero and Vocal Hero. Since it is from a magazine, it looks legit. I also saw the "Create Your Own Songs" subtitle. If they are actually going to do that, s**t is going to rocket out of my pants.
Video on Screwattack: http://www.screwattack.com/HardNews/051408