The Mercedes-AMG GT 73e is the forthcoming range-topper in the lineup of the brand's high-performance sedan. These spy shots catch a mildly camouflaged example under development in snowy conditions.

The styling is fairly familiar in comparison to existing versions of the Mercedes-AMG Four-Door Coupe. In front, there's a new lower fascia. The camouflage hides the design, but we expect a somewhat more aggressive look that visually identifies this at the top grade in the lineup.

Gallery: Mercedes-AMG GT73e Spy Shots

At the other end, the changes are more subtle. There are small revisions to the rear bumper, but the camouflage hides the tweaks. There's nothing significantly different from other grades of the saloon, though. A pair of trapezoidal exhaust pipes exit out of each side of the tail.

Interior photos aren't yet available but don't expect any major changes in comparison to the lesser grades. The trim might be a bit different, but the cabin is going to look largely the same.

Under the bonnet, there's a hybrid-assisted version of AMG's familiar 4.0-litre twin-turbo V8. It reportedly makes 805 bhp (600 kilowatts), which is a healthy upgrade over the 630 bhp (470 kW) from the GT 63 S. This setup can reportedly get the saloon to 60 miles per hour (96 kilometres per hour) in less than three seconds.

In late 2019, Mercedes released a teaser hinting at the GT 73e's debut in 2020. The vehicle didn't arrive during the tumultuous year, though. The prospects for its debut seem better in 2021. Although, the exact timing for the premiere is not yet clear. After the debut, expect this powertrain to show up in other Mercedes models, like the S-Class and next-gen SL-Class.