Now that Mercedes has introduced the new E-Class Sedan and Estate, it's only a matter of time before AMG will show the performance chops of the two midsize luxury cars. The "53" flavor will be the first to break cover, but in the meantime, there's still some testing that needs to be covered before the official premiere. Prototypes of the sedan and wagon have been spotted near the Nürburgring with less disguise while undergoing final evaluations.
