I like the idea of getting demos that show of the features of the console and Wario World would be a good tool to show these, I would have thought a Wario World Demo might be made like was given away with the Star Catalogue NDS, A familiar face to showcase the demos. Let people buy the full version, just give away enough to show of the controller.
I also think that downloadable demos would be a good idea from the start, It would get people to start using the service and new ideas could even be tested on customers before be implemented into full games later on.