GameSpot is reporting that details for Guitar Hero 4 have been released. The biggest news seems to be that the new release will be adding drums and vocals a la Rock Band. The new drums are to offer three pressure-sensitive pads (which can tell if you are just tapping or really wailing), two elevated cymbals, and a pedal. "The details in Game Informer also clear up the mystery surrounding the 'innovation' which Activision promised was coming to the Guitar Hero series in a recent earnings report conference call. The article outlines the game's studio mode, which will give users a variety of ways to create their own songs. Players will be able to jam along with one of the game's existing tracks, record songs as they're played, or meticulously detail note charts."