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  • 2020 Mercedes-AMG GLS63 spied - image 1
  • 2020 Mercedes-AMG GLS63 spied - image 2
  • 2020 Mercedes-AMG GLS63 spied - image 3
  • 2020 Mercedes-AMG GLS63 spied - image 4
  • 2020 Mercedes-AMG GLS63 spied - image 5
  • 2020 Mercedes-AMG GLS63 spied - image 6
  • 2020 Mercedes-AMG GLS63 spied - image 7
  • 2020 Mercedes-AMG GLS63 spied - image 8
  • 2020 Mercedes-AMG GLS63 spied - image 9
  • 2020 Mercedes-AMG GLS63 spied - image 10
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  • 2020 Mercedes-AMG GLS63 spied - image 12

The new GLS63 will boast a more powerful turbo V8.

Mercedes-AMG's next-generation GLS63 has been spotted undergoing cold weather testing in northern Sweden. As with years past, the 63 will stand at the top of the new GLS lineup.

Although still covered in heavy camouflage, this particular GLS can be identified as the hotter AMG 63 model thanks to its wide fenders, big wheels and massive brakes. In some shots you can also make out Merc's Panamericana grille that's reserved for AMG models.

The entire GLS lineup will benefit from new interior and exterior styling, as well as a major improvement on the technology front. Given the GLS' positioning as the S-Class of SUVs, we're expecting to see LCD screens everywhere and the latest autonomous drive systems.

Beyond those upgrades the GLS63 will benefit from AMG's latest 4.0L twin-turbocharged V8. Although smaller than the 5.5L turbo engine used in today's GLS63, the 4.0L will easily trump the 577 horsepower available in the current GLS63; we've heard rumors of 600+ horsepower.

The standard issue Mercedes-Benz GLS will debut either late this year or in early 2019. The GLS63, however, isn't expected to be introduced until sometime during the second half of next year.