The upcoming
Medal of Honor, which I am a little excited about, is
going to be using two, count 'em, two engines. The single player portion of the game will use Unreal 3 engine to tell the story. Once you hop into a game with other folks though, it's all Frostbite which is by DICE.
I don't think there's been a game that's gone the approach of using two different engines. I would love to know the logistics of this and how it all works out. Seeing as it's using two engines, I wonder if there was an effort to try to make both portions look like each other. I don't think we've seen any shots of the multiplayer mode so once that's shown more, I'd love to see the comparison between the two modes.