The co-producer for The Shield, Kurt Stutter, has been taken on to write a movie called Species X, according to Coming Soon:

...a drama about a police detective who realizes he might be from another world.

In the course of a murder investigation, the protagonist cop has reason to question who he is as a man, until he realizes he's not a man. A tug-of-war emerges among a faction of good and evil aliens.

Looks like they'll produce a videogame first based on the concept and a movie alongside the sequel game.

Species X, which will be produced by Basil Iwanyk and David Goyer, was hatched by Jason Hall and Nathan Hendrickson. Hall is an established gamer who runs WBIE, the only videogame publisher owned by a film studio.

He hopes to introduce the concept with the videogame, followed by a movie that will come out at the same time as a sequel game that expands the universe.

It sounds like an interesting project, but Stutter has only so far written a couple of episodes of The Shield,