I got my hands on a build of Colin McRae Rally 3 and I have to tell you that this game murders RalliSport Challenge in many ways.
Phenominal physics in this game is something that makes it really outstanding. No more arcadish RappliSport feel(I liked RSC a lot), but you get a much deeper and better thought of game. Real time damage is great and it affects your car's performance. It's so realistic that sometimes all it takes is one hit/flip and you see yourself losing a lot more time than you were before on turns(for example). You could even find yourself finishing the race on your rims if driving off the track too much. Car models look better than the ones in RSC too. environments were pretty good as well, probably not as good as RalliSport's, but I was promised that it'll be polished before the game makes it on the shelves.

w00t, I'm so excited, the game looks like it's got all a rally fan could possibly want/need.