Audi E-Tron city car

Our spies recently turned their lenses on this little guy in Berlin, deeming it an Audi concept for the coming Frankfurt Motor Show. Supposedly rolled out from under Audi's e-tron umbrella, its silent running suggests electric propulsion, and its tandem seating suggests an evolution of the Volkwagen L1 concept that bowed at Frankfurt in 2009.

That VW effort was a small-displacement diesel hybrid, and although the design was quite funky, it was more conventional with a fuller body that enclosed the rear wheels. This project from The Four Rings, on the other hand, is more like a sleeked-out version of Gordon Murray's T.25 city car. We have no idea what new thread this will start in the Audi quilt, but we'll bring you all the news from Germany next month.