This is the next generation Mercedes SL, which is due in 2012.
The car was spotted cold weather testing in Scandinavia in temperatures below minus 20 degrees last week.
The shape of the front end cladding appears to confirm that all future Mercedes's will carry styling hallmarks highlighted in the sculpture displayed by the company at last week's Detroit motor show.
Although the sculpture was specifically a teaser for the next generation CLS, elements such as the larger front grille and three-pointed star emblem are expected to be included on all future Mercedes models.
The proportions of the new car are expected to be similar to the current model's, although it will be considerably lighter through the use of more aluminium in its construction.
Key components such as the drivetrains, suspension and electrical systems are expected to be shared with the SLS supercar.