DOOM movie question

anyone know if the baddies in the DOOM movie will be from hell? i've heard rumours that they are aliens, and not hell spawn.

I also heard rumors that the script intended for the movie to take place on some place called planet Olduvai, but in the trailer, it says Mars research at the very beginning....

just hoping it stays original to the game in some way/shape/form..

Some say Aliens, some say mutants. I can't tell. I'd go with mutants myself.

Search for the many many threads there have already been about the Doom movie for information and speculation about these points.