Audi will be using the upcoming North American International Auto Show in Detroit to show off a ‘stunning’ new concept car. The German luxury brand also plans to have a world premiere of a new model. Both these cars will be unveiled during Audi’s press conference at the show, which will be broadcast worldwide.

While Audi has provided no indication as to what each car will be, it is believed that the concept will be based on the R8. According to our previous report, Audi expects to release a V10-powered R8 (possibly known as the RS8) around September next year, and a preview of this would certainly help in allocating quite a few cars before they’ve even gotten off the production line. However with a R8 convertible (// set for 2009, it could be either one.

As for the other car, a facelifted A3 is due to be available in June 2008, making it most likely that this will be Audi’s world premiere model.