Everybody knows about the i8 Roadster hybrid concept by now. It's a game-changing vehicle, in its own right, and at least 90 percent of the car will translate to the production model in 2015. However, do you remember the Vision EfficientDynamics concept from '09? See a resemblance? Basically a blueprint for the i8, the Vision combined a three-cylinder diesel and two electric motors, all while sitting under a hot aerodynamic, glass-doored 2+2.