Activision just posted a press release announcing that RedOctane's Guitar Hero II is coming to Xbox 360.  From the press release:

"The tour will continue the rockin' gameplay Guitar Hero fans have come to enjoy, and will now include expanded Xbox 360 capabilities," said Kai Huang, president of RedOctane. "With Guitar Hero II for Xbox 360 rock rhythm, lead, or bass guitar tracks with downloadable content and the new X-Plorer® controller, designed specifically for the Xbox 360."

RedOctane will reveal an early glimpse of Guitar Hero II and the X-Plorer controller at X06, the Xbox® brand experience for the games and entertainment industry, being held on September 27th and 28th in Barcelona, Spain. This industry event is open to media and retailers from around the world to view the next-generation of games and accessories.

To celebrate, Major Nelson posed for a photo at X06.  Turn it up to 11!

We also released a list of the games we are showing, or that we announced, as a press release this morning.