More details of the next-generation G-Class emerge during the testing phase.

We're a bit sad to see the current Mercedes-Benz G-Class disappear off the market, but the next-generation 4x4 is close to a debut, possibly as soon as the Detroit motor show in January.

A new spy video has revealed the latest state of the G63's development...and this one features a digital instrument panel. A mule in previous spy shots (see the gallery below) provided a better view of the cabin, but that model had analogue instruments.

It's not clear at this point whether the earlier model is simply early in development or whether Mercedes intends to offer the digital panel as an option. In addition, the interior features a large display on the centre stack. Below it, there's metallic trim surrounding stylish vents and an array of physical controls.

This video shows two test mules under development. One of them appears to be in a more finished state – the headlights are under heavy concealment, but the engineers have exposed the LEDs in the centre. The other model in this clip has standard halogen lights.

In profile, the G63 continues to look tough. It features the traditional muscular bumpers, upright stance and side-exit exhausts. At the rear of the new car, there's a big rear window and fairly tiny rectangular taillights.

The next G-Class reportedly rides on a new platform that helps it cut a significant amount of weight. Mercedes-AMG's 4-litre twin-turbo V8 would power the new G63, and the 6-litre twin-turbo V12 would continue to motivate the G65.

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Next-Gen Mercedes-Benz G63 Spy Video