I don't have official details on the new S63 AMG yet, but I expect the company's twin-turbocharged 5.5-liter V8 to be found underhood, putting out something like 550 horsepower in the base model. (Like the new E-Class, an S model will likely be offered). The AMG Speedshift dual-clutch transmission and all-wheel drive will likely be part of the S63 AMG package, too.