The Lexus LF-A concept car has made a public appearance at the Tokyo Motor Show and elsewhere. However, while the shiny display model was on the Lexus stand, a black-clad prototype has been in testing since April.

These latest photos show engineers putting the car through the paces at Germany's Nurburgring circuit. The car's complete roofline is now visible, and we expect more camo will be dropped in the coming months.

Toyota officials let slip in Tokyo that the production car, likely to be called the LF-H, is going to have a V10 engine, developed from the engines in Toyota's F1 cars, which is thought to develop over 500 hp. Although the engine is front- rather than mid-mounted, the LF-H will be rear-wheel drive, and Lexus has promised "the ultimate weight balance," "extravagant comfort" and "precision operation." The LF-H hasn't yet been confirmed for production, but the continued and sustained testing of prototypes suggests that it's a pretty definite contender.