I saw on Shacknews a link to DarkHorizons.com which brings news from the set of the Doom movie.
Screenwriter Dave Callahan claims "everyone was keen to keep the game's atmosphere", though there are some "minor" changes done to the film's concept: The monsters have nothing to do with hell, the plot is not taking place on Mars and "space marines" are not well "space marines" as their outfits are more like SWAT team members.
Another fun tidbit: The monsters are people mutated by a virus
. To paraphrase David Spade, I liked it better the first time, when it was called Resident Evil