A tweet from "#MOH" (EA Los Angeles), and another from EA Community Manager @matthewpruitt confirm that the single-player portion of the game will use a "heavily-modified Unreal 3 engine."

Another tweet from DICE Frostbite developer "@repi" let more information slip:

@repi: Guess it is out today: EALA uses a heavily-modified Unreal Engine 3 for Medal of Honor SP and we, DICE, use Frostbite for the MP portion

This was quickly followed by another confirmation from @matthewpruitt:

@matthewpruitt: I guess the cat's out of the bag. Medal of Honor's multiplayer will be using the Frostbite engine.

Bluesnews also notes that a Planet Medal of Honor post summarizing the revelations points to an interesting quote from a hands-on preview of Battlefield: Bad Company 2 out of IGN.com's UK office. In the preview, DICE President Patrick Bach comments on potential similarities between Medal of Honor's multiplayer and that of DICE's Bad Company 2. "I think it would be hard to not have anything feed in [from Battlefield]," said Bach. "We're using the Frostbite engine and it's amazing to see how it can build a completely different experience," he clarified.

Medal of Honor is due out for PC, PS3 and Xbox 360 in Fall of 2010.