Viper Concept Ford GR-1 / Shelby Concept?

Ford GR-1 / Shelby Concept? - viper concept

In 2004 Ford Shelby has found an idea seemed like a fastback, and has recently been in the finale of a TV commercial for Ford Racing (only the rear of the car ... I think) Has anyone you know anything more about it. As it should be built and whether it is the competition on the Vette or Viper