http://www.youtube.com/watch?v=YVjKx0rS1OE <= PC Version Trailer
http://www.youtube.com/watch?v=jt28UUvMX5Y <= Gameplay Trailer
The videos really don't do the graphics quality justice. This game is beautiful on the PC.
I finally got the chance to play this game on my PC and it is awesome. I must mention that I'm an adult and I don't care for Nintendo games anymore. Sure, I've got a Wii and the Nintendo games, but they've lost my interrest completely. This game, however, has grabbed my eyeballs and won't let go. Sega did a fantastic job with it. Every aspect of this game shockingly delivers. The PC version even has Team Fortress 2 characters. Grab a few 360 controllers and you can do four player split screen on the PC. Comparing it to Mario Kart, this game is a party while MK is something to do when bored. I'm hooked. You've got to check it out.
UPDATE: I took some screenshots. Enjoy.
(The screenshots were reduced in size by half using bicubic sharper.)