Amazon and Gamestop seem to be ahead of Activision. Within the last couple of days a new Guitar Hero game has shown up on their respective sites.
Guitar Hero: Warriors of Rock has been posted as a new title. The sites both list that the game will be available for the PS3, Xbox 360 and the Nintendo Wii. They will also be available in two different bundles, the Guitar Bundle and Super Bundle.
For the game only, it is listed as $59.99, Guitar Bundle is $99.99, and the Super Bundle will retail for $179.99. According to the websites the title will be available on September 21, 2010.
No other information is given, and Activision has not responded to our emails, but stay with ICGamers Network for the latest news on Guitar Hero: Warriors of Rock.