Heard of the A3 e-tron? No, it's not the sequel to the latest Jeff Bridges movie. Nor is it the name of a highly-advanced new video game. Sorry to disappoint gamers and Tron enthusiasts, but the A3 e-tron is an Audi concept model that displays the brand's cutting-edge, battery-powered technology. Arguably cooler than the previous two possibilities, we'd say.