To quiet all the naysayers saying Activision has not announced enough Guitar Hero games, the prolific publisher added one more to the music franchise: Guitar Hero ... PSP. A late-night Activision investor call made mention of a PSP iteration of the rhythm game, which promises to feature "a drum component," according to Gamespot. Further details aren't available yet, but we'd be unsurprised if it looks a lot like Rock Band Unplugged. Chances are we'll see more of the game when Sony officially unveils the PSP Go! at its press conference tomorrow.