GMC has recently posted a video on its Facebook page that features something no one expected. That is a Call of Duty collaboration that likely created a limited edition model. According to the post, the vehicle will be revealed on September 15 at 1 PM ET on Call of Duty Next. The video shows a shot of a road with a view of mountains in the distance; the sun is setting and from behind the camera. We can hear a vehicle approaching quickly, the tires on the gravel, the electric whistle of the GMC Hummer EV on approach. Unfortunately, the truck flies by way too fast to get a good glimpse of it, an…