Playstation's popular driving franchise, "Gran Turismo," is celebrating its 15th anniversary this year and to commemorate the incredible achievement, leading automakers have created one-of-a-kind, futuristic concept cars that will be available for download in the latest installment, "Gran Turismo6." Volkswagen, BMW and Mercedes are just a few of the brands that have unveiled their models for the classic game, and just recently, Nissan was added to that list, debuting a striking ultramodern car unlike any other: the Nissan Concept 2020 Vision Gran Turismo.