It looks nice, which probably means it will suck.
Anyway, here's the 35mb trailer if you don't want to trudge through their bloated and flash crazy website:http://www.nugenerationgames.com/DirtTrailer.zip
Having known about this game for 17 minutes now, I'd say it looks like a cross between Max Payne and Oni. If they are striving for a highly controllable movement like Oni, that will be a good thing since Oni is still unequaled in player movement to date.
I predict no multiplayer, but since it's not even addressed in the FAQ that's a safe bet. If you have to ask, the answer is no.