The screenplay is by Michael Roesch and Peter Scheerer (Alone in the Dark, House of the Dead II). Gamerflicks notes:

It's unknown how close the movie will stick to Ubisoft's game story although the change of location from a tropical environment (the setting of the game) to Vancouver's coastal rainforest may require some modification to the screen story. The game follows Jack Carver, an ex-Special Forces soldier, who is hired by a journalist named Valerie Constantine to take her to a seemingly remote and unpopulated island in Micronesia. Shortly after arriving on the island Jack is attacked by mercenaries and separated from Val. As he begins tracking his employer across the jungle Jack discover that there are strange mutated creatures...

Keep in mind that Uwe is possibly just misunderstood as he rapes and beats your favorite game universes and displays the bloody carcass on the silver screen. He's had enough of your whining though and he'll even take you on in the boxing ring. Assuming you don't have any actual boxing experience and weigh at least 75lbs less than he does.