The four door sedan will carry the GT 4 name and is expected to be unveiled as a concept next year as AMG celebrates 50 years of making normal Mercs go faster.
The AMG GT 4 is expected to make use of the 4.0-litre twin-turbo V8 that is currently used in the AMG GT sports car. The power output is expected to be in excess of the 604bhp produced under the hood of the Mercedes E 63 S AMG sedan (pictured above).
AMG is also expected to couple the V8 with the new Integrated Starter Generator that will first be seen under the hood of the facelifted S-Class that will debut in 2017. The engine will send power to all four wheels with the help of Merc's 4Matic all-wheel-drive-system.
The new AMG GT 4 will sit on a modified version of Merc's modular rear architecture (MRA) which will be modified for the GT 4 and will feature "unique" wheelbase and track width measurements. The MRA setup underpins the likes of the C 63, E 63 and S 63 AMG sedans.
Along with the GT 4, which will be AMG's third dedicated series production car, Merc's performance arm is also expected to unveil its F1-engine powered hypercar as part of its 50th Anniversary celebrations.