"In fiscal 2009, we plan to publish Guitar Hero: On Tour for the NDS; Guitar Hero: Aerosmith, Guitar Hero: Metallica, and Guitar Hero IV across multiple platforms," the company said in the filing.

Activision's 2009 fiscal year ends on March 31 of next year, pinning the previously unannounced Guitar Hero: Metallica for a release prior to that time. The multiple-instrument update to the series, Guitar Hero IV, is expected this fall, making a release in the 2008 calendar year unlikely for Guitar Hero: Metallica.

No platforms were divulged in the filing, though Activision's other band-centric offshoot Guitar Hero: Aerosmith is slated to appear on the PlayStation 3, PlayStation 2, Xbox 360, and Wii.

Thanks to Masem for the heads up.