Hey, awesome. Long-time Guitar Hero developer Neversoft Entertainment appears to be working on a new shooter. Super sleuth website superannuation has discovered a recent LinkedIn job listing from the studio asking for an experienced level builder to "work on [a] new action shooter game." It's required that the builder must be able to "build realistic 3D levels and environments."
In addition to whatever this shooter is, Neversoft is developing Guitar Hero: Warriors of Rock. It's due out in September and has a campaign component narrated by the nastiest dude on the planet, Gene Simmons.