Looks like a decent arcade-style racing game. Totally open-world environment, you basically can make your own "track" to finish the races. And there's dynamic environmental effects (tornadoes, blizzards, rain, etc).
14,000 square km's is the total world size, 100,000 miles of roads, and a 40km draw distance

Apparently all of which is based off satellite data of the US.
And since it's Codemasters, I'm assuming it's running on a fairly decent engine (apparently it was 4 years in development) so hopefully it won't totally rape my PC...
Comes out May 29th.
Fuel. The official game site