
In a post at Race Sim Central, Codemasters community guy Rich Tysoe said this about the physics engine: "no carry-over code from previous CMR games at all so physics and damage is all-new (and very nice)."

Steam has slashed 75% off of several Codemasters' racing titles including GRID, FUEL, DiRT, DiRT 2 and ToCA Race Driver 3 along with a bundle containing all five titles as part of its weekend deal promotion.

The first DiRT title was released just before McRae's horribly premature passing, and saw Codemasters essentially rip everything up and start again, giving the franchise a face-lift fit for the next-generation. It highlighted the tone of a series moving increasingly further from the realistic, 'pure' brand of rallying in the earlier games to a more arcade-orientated, thrill-seeking approach. Whether seduced by the bright-lights of, for example, Project Gotham Racing, or whether Codemasters were just seeking change for the sake of change lest creative stagnation take hold, DiRT 2 (yes the strange lower case 'I' is intentional) represents the consolidation of this new approach.

Colin McRae: Dirt 2 (Dirt 2 outside of Europe) is a racing game scheduled to be released in September 2009, and is the sequel to Colin McRae: Dirt. This is the first game in the McRae series after Colin's death. It was announced on 19 November 2008 and will feature the late Colin McRae as well as Ken Block and Travis Pastrana.
this game in motion. =]
i can see and hear dirt pebbles hit the tv screen and make that noise. that be cool
My guess is that in the upcoming weeks we'll see some video from it, maybe old engine vs new engine.
There's definately potential based on this single image.