Mercedes-Benz S-Class Coupe AMG

Mercedes-Benz is already hard at work on development of the S-Class Coupe, the car that will replace the CL-Class and that was previewed as a concept at the Frankfurt Motor Show. And the car in this latest set of spy shots – which our spy photographer claims is an AMG variant based on its aggressive front fascia, quad exhausts and huge brakes – looks rather far along in the development process.

According to our German informants, this particular prototype has the singing voice of an AMG, and is described as sounding "great." Making that noise should be AMG's 5.5-liter, twin-turbo V8, despite claims of it being near death. While it produces 577 horsepower in the S63 AMG, our spies seem to think it'll get a small bump to 585 horsepower, which contradicts previous reports. Performance should be AMG-worthy, with an expected sprint to 62 miles per hour taking around four seconds.

Take a look up top for the full batch of spy photos.