Rock Band owners were given the luxury to continue to buy new tracks for the music title even after the release of its sequel, Guitar Hero fans won't be given the same option when Guitar Hero 5 lands on store shelves. An Activision representative told Destructoid that DLC for the upcoming Guitar Hero 5 will not be compatible with Guitar Hero: World Tour.
According to the Activision rep, Guitar Hero 5 DLC will be compatible with future titles in the franchise, but "advancements and innovations" made to the upcoming music title do not allow for tracks to be backwards compatible with World Tour. Don't light the torches and grab the pitchforks just yet though, the same reason has been given for The Beatles: Rock Band's inability to work with previous versions of the game.
Thankfully, Activision has already confirmed tracks from Guitar Hero: World Tour will be compatible with Guitar Hero 5 via an in-game importing process -- which adds new features such as band moments, expert+ drumming and the new vocal star power to older tracks.