Next-generation family hauler gets some serious grunt
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A prototype believed to be the next-generation Mercedes-AMG GLS63 has been spied this week on the snowy roads of Europe, ahead of an anticipated market introduction sometime in 2019.

The burly SUV test vehicle is the first time we've seen pictures of the AMG-fettled version of Mercedes-Benz's upcoming full-size SUV, complete with pumped guards, larger alloy wheels, and an early version of the company's new Panamericana front grille.

While finer design details are concealed under the swathes of swirly camouflage and false body panels, we can see the new GLS wil maintain its long and boxy shape, though the front and rear ends will get design touches in line with recently-updated stablemates in the Mercedes range.

A long, high roofline and long wheelbase demonstrate the GLS's commitment to rear passenger space in both the second and third rows of seating. Expect the new model to measure over 5.0 metres, like the current one.

This particular vehicle can also be distinguished as the AMG version thanks to its large (and mismatched) alloy wheels, which cover a substantial braking package – including large cross-drilled discs at the front.

Another giveaway is the pair of large tailpipe finishers sticking out of the rear bumper, which no doubt will morph into quad-style units when the GLS63 hits production.

Power for the new performance flagship is expected to come from the familiar 4.0-litre twin-turbo V8 used in various Mercedes-AMG models, developing between 420kW and 450kW – it's expected a 'standard' GLS63 and a hotter 'S' version will be offered.

The new model is expected to shed a decent amount of weight too, thanks to its new 'MHA' underpinnings which will be shared with the next-generation GLE.

In terms of timing, the new GLS family is believed to be on track for a 2019 market introduction, with a reveal to come either very late this year or early next year.

Stay tuned to CarAdvice for all the latest updates. Click the photos tab for more images.