A new trademark has been uncovered in the Guitar Hero franchise entitled “Guitar Hero – On Tour”.  Many believe this to be the name of the upcoming DS version of the game which is said to use its own peripheral rather than the touch screen:

Activision revealed plans for Guitar Hero DS last year, but has since only confirmed that the game will use an all-new peripheral made for the DS and will not use the touch screen and stylus.

We should be hearing more about Guitar Hero for DS very soon since it was announced quite some time ago.