Mercedes-Benz just can’t keep spy photographers away from its next SLK roadster. This time, the two-seater model with the retractable hardtop was spotted undergoing hot-weather testing alongside heavily cladded prototypes of the 2011 CLS sports saloon in the infamous Death Valley in the southwestern United States.

The 2011 model of the SLK will bring a more angular design themed after the SLS AMG ‘Gullwing’ supercar along with a revised chassis and new engine options that are said to include for the first time a turbo diesel unit.

While the new CLS sports sedan is tipped for a Paris Motor Show debut in late September, we’re still not sure when and where the SLK will make its first public outing. Word on the streets says Mercedes may unveil a near-production concept model either in Paris or Los Angeles towards the end of the year. Either way, Stuttgart’s BMW Z4 fighter should arrive in showrooms by next summer.

Via: Youtube/AMS