The Wii Us at Targets now have Mario Kart 8 in them so yeah, go play it. One thing I noted from the demo is that there were jagged edges everywhere. It could of been the TV or maybe its because its a demo (I played sunshine airport) but its kind of distracting.
p.s. Circle Pad Pros are $10 at Target. But don't only 5 or 6 games support it?
Off the top of my head Monster Hunter, Resident Evil, Kingdom Hearts, Kid Icarus and Metal Gear Solid 3.