The truck in the video below is a “mule”, a kind of prototype that comes after a concept vehicle but before a pre-production model. Mules exist to test prototype components—often years ahead of production. They may contain parts from a mix of vehicles and a body from some other vehicle of about the same size. Compared to a mule, a pre-production model is much closer to the final product.
In the video below you can see what happens when the guys from TheFastLaneTruck.com encounter a mule of what is believed to be the 2015 Chevy Colorado. I have no idea how they knew where this truck was being tested or whether or not the whole thing was set up as a publicity stunt.
What I do know is that when the economy was at its worst Ford and GM stopped selling midsize trucks (Ford Ranger and Chevy S10) in the U.S. The result: Toyota and Nissan have been able to monopolize that part of the market. That GM and Ford reversed direction so quickly suggests they realize it was a mistake to stop selling midsize trucks here while continuing to sell them in other countries.