Spy shots: Next-gen Mercedes Benz CLS caught winter testing

The Mercedes Benz CLS ignited the four-door coupe market when it was introduced back in 2004, and since then we've seen several other luxury rivals attempt to emulate the design with cars like the Porsche Panamera, Audi A7 and Aston Martin Rapide all under development. Now the first prototype for Mercedes' next-generation CLS has been spotted, revealing a few subtle clues about the new model (previously we saw a test-mule disguised under the sheet metal of the current model). The new car is expected to be launched in late 2010 as a 2011 model, and positioned more upmarket to bring it in line with some of its more premium rivals. 2011 Mercedes CLS spy shots