It has been confirmed at the Ubidays event in Paris that the new Dark Messiah of Might and Magic game is an Xbox 360 exclusive port of the original PC game. The Xbox version, the first console version of a Might and Magic game in years, will include additional content. Eurogamer said they would publish their first impressions of the game soon.

So no expansion for Dark Messiah for the PC. It will be interesting to find out if the game will be better received on a next-generation console.