I had about the same thoughs. Fricken sweet, and something finally a little innovation comming out from the wii.
Innovation? Black and White was doing this in 2001.
At least, that was a promised feature. I can't remember if that made it into the final game, or if that was just typical Monoleux rambling.
Regardless, it's a pretty old concept.
not only that, Capcom had Solar Boy Django with an actual light sensor on the cartridge to affect gameplay and stuff. Pokemon had a real time clock which would change from night to day. This is basically just the next step.