According to two more than one reliable source, Audi is set to unveil the roadster version of its awesome R8 at the Frankfurt Auto Show this September. But that isn’t the only R8 set to debut.

The R8 Roadster will be available in both V8 and V10 versions with 420 and 525 horsepower respectively. 

A drop-top version of the R8 has been in the works for some time and rumors that Audi would build such a car emerged just shortly after the original V8-powered machine launched. Having a convertible version would not only allow the R8 to take on cars like the Porsche Carrera Cabriolet and 911 Turbo Cab, but it would also allow Audi to capitalize on a successful platform by building more (even higher priced R8s) but in a different class of vehicle so the car will retain its exclusivity.

The surprising bit of news is that Audi will be launching yet another version of the R8 - an electric version. This car will no doubt be a concept and will likely see the same fate as the R8 TDI. Still, it will be interesting to see what the Audi engineers can come up with.