The biggest surprise of Activision's Guitar Hero 5 pre-launch event in San Francisco wasn't the addition of a hot band to the song list or something to do with DLC; it was a game mode exclusive to the Wii version called "Roadie Battle," which wound up being the most refreshing and fun addition to the series since ... ever.
In this guitar-only duel, two players can assist the pair battling on the big screen using Nintendo DS. Using DS Download Play, the Wii transfers the Roadie Battle "app" to both DS units (two human "roadies" aren't required; the CPU can fill in for the friend-deprived) and the (frantic) fun begins.