i think gh has now done the hiatus. So Activision is going to make:
Guitar Hero Collection HD (with GH1,GH2 and GH Rocks the 80's) for PS3 and 360
Guitar Hero 7 (for PS3, Wii, Wii U, Xbox 360, Vita)
Dance Hero (for Xbox 360 Kinect)
DJ Hero 3 (for PS3, Wii, Wii U, Xbox 360, Vita)
Sing Hero (for PS3, Wii, Wii U, Xbox 360, Nintendo 3DS, Vita)
DJ Hero 3D (Nintendo 3DS)
It can be happen for 2012. Guitar Hero will be back!!!
Also Hero franchise will go on 3D gaming. Guitar Hero, Sing Hero and DJ Hero is coming to Playstation Vita!!