I bought rockband 2 and all the new plastic controllers to go along with it the other week, and I was wondering if guitar hero world tour (the game itself) would be compatible with my rockband 2 guitar/drums. (Meaning can I play the new guitar hero game with rockband 2 instruments on the ps3)
Yes. RB2/RB and GHIII/GHWT instruments, as long as they are on the same system, are all compatible.