They'll offer it separately for PS2 surely.
Maybe for 360 as well, since those two consoles have guitars out there already.
But for Wii and PS3 I don't see why it'd get sold separately, since there's no usable guitars for those systems yet.
I think it's dumb that the PS3 doesn't have PS2 controller ports...
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )