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.