The future range-topping car, first confirmed back in 2016 by AMG boss Tobias Moers, is now under development and is pipped to receive AMG's turbocharged 4.0-litre V8 engine in a state of tune offering at least 630bhp.
This is the figure offered by the current most powerful AMG model with that unit, the recently revealed GT 4-door Coupé. Any growth on that would ensure the Black Series dwarfs the peak output offered by the current GT champion, the 577bhp GT R. It would also edge it towards one of the category's most radical supercars, the 690bhp Porsche 911 GT2 RS.
The GT Black Series' extra grunt will be accompanied by a more focused chassis and aerodynamic set-up. A recently spotted development car dressed in GT R clothing at the Nürburgring is believed to be part of the Black Series test programme and offers some clues as to what's to come.