The new model - reportedly called ‘GT4’ but codenamed ‘X290’ to Mercedes insiders - would feature ‘four-door coupe’ styling, but would not simply be a stretched version of the GT.
Benz has the CLS-Class as a similarly-sized four-door coupe, but the GT4 would reportedly offer more extreme styling with performance likely to match.
So while a future GT4 could feature a similar look to the AMG GT, it could potentially sit upon the same platform as the CLS
Using the CLS as its base would also mean the GT4 could offer the full range of CLS powertrains, although which of those engines Mercedes would choose to make available is unclear.
The AMG GT's platform, by contrast, is specific to that model and incorporates a rear-mounted gearbox linked to the engine by an aluminium torque tube - a configuration not ideal for a four-door. It's also only designed to accept the GT's 375kW and 650Nm 4.0 litre twin-turbo V8.
The report also contends that the arrival of the GT4 will mean the end of the CLS Shooting Brake, due to a lack of interest from the US and Chinese markets.
If it happens, we could expect all-new body panels to facilitate Benz’s step into a new market segment, perhaps three variants - AMG, AMG S and AMG Sport - and a price somewhere between the CLS and AMG GT.
Whether Mercedes introduces a GT4 or not remains to be seen, but for now, customers in Australia can order the Mercedes-AMG GT coupe with prices starting from $295,000 plus on-roads.