Guitar Hero: On Tour Decades was announced for the Nintendo DS at the company's E3 Press conference. Following the announcement of the new rhythm game was a on-stage video of gamers playing the game with the DS's touch screen and pick.
The newest feature announced for the title is the ability to share streaming music between the games. As Nintendo explained it at the conference, a player with Decades could play against a player with the first GH: On Tour and pick songs from both game's setlists.
Unfortunately there is no release date or song list announced as of yet, but stay tuned to IGN for your E3 updates.