Volkswagen returns to its rear-engined roots with the up! concept, unveiled Monday before the Frankfurt Auto Show. VW CEO Martin Winterkorn gave a strong indication the four-seat car could see production one day as a part of the company's New Small Family lineup.

Winterkorn also hinted at the car being sold internationally under VW, Seat and Skoda brands to spread around costs.

The up! is about 136 inches long and 64 inches wide with seating for four, rear-wheel drive and modest luggage space under the hood. A VW logo faintly shows through the rear plastic hatch, but glows when the brake lights come on.

With the up!, VW is breaking its recent trend of chasing the high-end of the market at the same time it brings back a Volkswagen power train setup not seen since the original Beetle. Formula for success? It worked once before.