What you're looking at above is the rear quarter of BMW's Frankfurt Motor Show bound, Vision EfficientDynamics sports car concept. The teaser photo comes only two days after the release of a short video clip that shows driving images of the concept from an externally mounted camera. We're still in the dark about the details but the new photo pretty much confirms that the Vision EfficientDynamics is an entirely different concept than the four-door coupe that was spied a couple of weeks ago.BMW said on its official IAA Frankfurt Show blog that it will release more information on the green sports car concept that's supposed to demonstrate "how efficient a sports car can be", on Sunday, August 30.
