We just reported a few weeks ago that Activision has discontinued the GH franchise and they won’t be dishing out any new DLCs after February. However it seems that the fans won out on the other half of the Activision move.
According to Gamespot, Activision has decided to provide new content for DJ Hero and Guitar Hero even after they confirmed “No DLCs after February”.
DJ hero and Guitar Hero will at least get a track pack for both games because the fans have been clamoring for it. The release date and what songs will be included in the packs are still left unsaid.
[Gamespot Asia: More Guitar Hero, DJ Hero DLC Coming]