It has been succesfull on All Consols and is now for the first time coming to a handheld!

If you see the pics, you will notice that you get this GBA cartridge with the gh buttons and a strap to put around your wrist, and instead of stylus you get a plectrum to strum with. you hold the game sideways, with the buttons on one screen and the guitar on the other. you press the buttons and strum the guitar strings. GH on another level.

In my humble opinion, this game have the potential to be a great game. Comes out sometime this summer i believe.