Mercedes introduced the 2021 S-Class last fall and now the company is turning its attention to the AMG variants.

That’s clear today as a high-performance prototype was spotted undergoing cold weather testing in Sweden.

While the model is heavily disguised, it features a Panamericana grille and a more aggressive front bumper. The latter is covered by camouflage, but it should follow in the footsteps of the AMG Line variant which has pronounced air intakes.

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Moving further back, we can see a five-spoke AMG wheel and a discreet charging port on the rear fender. The model has also been equipped with a rear diffuser which is flanked by a traditional four-tailpipe exhaust system.

Spy photographers haven’t managed to get a glimpse inside, but we can expect an AMG steering wheel and optional carbon fiber trim. They should be joined by a 12.3-inch digital instrument cluster and a 12.8-inch OLED infotainment system.

Of course, AMGs are all about the engine and this particular model should be interesting as it’s a plug-in hybrid. While details remain unconfirmed, the S63e should echo the S580e.

This means we can expect a twin-turbo 4.0-liter V8 as well as a 28 kWh lithium-ion battery and a gearbox-mounted electric motor. Speculation has suggested this could give the car a combined output of around 690 hp (515 kW / 700 PS). That’s pretty impressive and so is the expected electric-only range of around 62 miles (100 km).

The S63e is slated to debut later this year and could be followed by an even more extreme S73e variant.

Picture credits: CarPix for Carscoops