For anybody with a Wii and a DS, the demo for the DS version of Sonic Colours is up on the Nintendo Channel.
It's pretty much a new Sonic Rush, but instead of doing tricks to build the boost meter, you collect blue wisps. There's also a fire special ability that you get from the red wisps. It's pretty fun, but it's only one act, so it goes by quickly. Lots of paths though :D.