Thanks Milabrega for the summary:
Guitar Hero DS:
-The guitar Grip in GBA slot. You can strum on screen with stylus or the guitar Pick that comes with the game.
-Works with the DS and DSLite. Will support DS through an adaptor.
-Likely need headphones to get the most out of the music, though it should still be good
-Star Power Moves that affect your opponent. Like the stage catches fire and you have to blow into the DS, or a fan shows up and you have to sign her shirt.
-43 MB limit on WiiWare Games
-Look a little slow
-Kirby Canvas style
–Day 1 Wii games, Day 2 WiiWare, Embargo up Monday (Media Summit)