IGN writes: "Speaking in the May issue of Conde Nast Portfolio magazine, Activision CEO Bobby Kotick revealed some of Guitar Hero's future plans. Other instruments are apparently getting the Hero treatment, including vocals. The fourth installment of the franchise will also let players jam along with local bands from their area.
"It's not just about guitars," Kotick says. "We'll include a lot of other instruments, vocals. It will help us expand internationally. It's the first game we've had in which we can use local content and local bands."
IGN is awaiting clarification from Activision."