According to Eurogamer, Activision CEO Robert Kotick let it drop
at the Goldman Sachs Communacopia XV Conference (that's a mouthful) that Guitar Hero
would appear "on every significant new format."
We can only guess this means whammy-barring on the Xbox 360 is pretty much confirmed, with Gamestation employees hearing earlier this week that they will be getting Guitar Hero II
for that console in early 2007.
With the Wii, DS, PSP and PS3 being significant new formats, chances are you might be able to jam just about anywhere.