I bet it's a DS to GC thing.
Enhance gameplay? Connectivity? If it's not something for DS to GC, it sure does remind me of the buzz being thrown around when the Expansion Pak for N64 made it's rounds.
A peripheral that boosts the power of the system? Game Cube Advanced? Hell, look at what devs could go with an extra 4 MB of Ram...
This could get very interesting...
Uh what? *Plays Starcraft*
I played Starcraft a couple of days ago... it has lost about 0.02% of its quality in the years since release.
That is, it's still the best game ever. :)