VOLKSWAGEN TO UNVEIL GTI ROADSTER, VISION GRAN TURISMO AT WOERTHERSEE FESTIVAL Design sketches show extreme GTI concept for the Sony® PlayStation® videogame Herndon, VA  — The GTI Roadster, Vision Gran Turismo is a supercar that has been designed for a singular mission: the hugely popular Sony® PlayStation® videogame. This extreme and ultimate interpretation of the Golf GTI will make its debut at the Woerthersee Festival in Austria that…