Today, a few unofficial sketches with the upcoming 2013 Mercedes-Benz S-Class Coupe Concept have surfaced the web. The German prototype will be officially unveiled, next week, at the Frankfurt Motor Show. 

In terms of design, the S-Class Coupe is very different from its sedan brother. It has a more aggressive front spoiler and grille. The sloping roofline and the slender taillights are completing the exterior modifications. 

Inside the cabin, everything is the same like in the sedan version. There are only a couple of modifications: a new three spoke steering wheel and sportier seats.

The production version of the S-Class Coupe could probably debut in January at the 2014 NAIAS and will arrive in showrooms next March.  

Source: WCF