Talk about a name dropping, E3 is all about hyping upcoming titles to get people stoked and talking about the games. Nintendo had very little to say but to let the name slip Guitar Hero On Tour: Decades with a few minor tidbits about what we can expect.
First, we can expect massive carpel tunnel syndrome. Second, you can expect something similar to what we’ve seen in Guiter Hero On Tour with a few minor tweaks:
“They did reveal that the game will feature song sharing between Nintendo DS handelds, which would mean one copy of the game has the potential to have a song the other doesn’t? Could there be DS downloadable tracks in the near future?” (kotaku)
It seems a bit quick to be pushing towards yet another release, although no dates have been set besides “coming soon.” Had it been Sony, we could expect soon to be a few years, but Nintendo is usually pretty prompt when it comes to release schedules. Of course, they’ll wait for the On Tour sales to die down before we see the Decades release.
Unfortunately no songs have been talked about yet, it was really more of a name dropping than a detailed announcement. Perhaps they didn’t have a large enough E3 press release time slot, or they were much more jazzed to talk about the Wii Motion Plus product and Wii Sports Resort.
If you’re looking to see what the next greatest DS hand-held will look like, plan to wait until Nintendo starts to see 
Imagine that, the kids hand held grows up and is getting a Grand Theft Auto title. The game will, of course, be a sandbox-style title true to the franchise history and will feature new characters and a new game engine.