Rendering Architect at DICE, Johan Anderson,
stated it took about 3 hours to port their Frostbite engine to DirectX 11. The engine powers
Battlefield Bad Company 2 and
Battlefield 1943. No DirectX 11 hardware exists yet however so we won't know if having the engine run on DirectX 11 will produce any performance benefits. Still, it's good to know that if and when DirectX 11 is available in both hardware and software, there's at least two games that will be able to say they run on DirectX 11.