It looks like Mercedes-Benz is on the crossover offensive this year. Just a few days ago, the automaker was spotted testing the upcoming GLB which will essentially serve as a longer version of the GLA. Now, our spies were able to spot Mercedes-Benz testing another SUV only this time it's the next-generation GLS.

First spotted by our insiders back in September 2017, this is the first time the prototype luxury SUV was seen braving the cold winter in Sweden. Based on the photos, it appears nothing much has changed on the GLS although we do get a better look at the redesigned headlights that come with LED lighting.

Spied: Mercedes-Benz GLS

Despite the heavy camouflage, we see that the new GLS will have a sleeker design overall compared to the outgoing model. It also has what looks to be a reworked front grille and larger quarter panels. Topping it all off is what appears to be a bigger sunroof which was covered when we first saw the prototype last year.

The rear is pretty much covered up as well thanks to the camo livery and false body panels. Upon closer inspection, however, we did notice that the new GLS gets longer third-row windows. This could mean that it will have improved cabin and luggage space.

Spied: Mercedes-Benz GLS

The next-gen Mercedes-Benz GLS is expected to be underpinned by the flexible MHA platform. Aside from being significantly lighter than the current platform, this will also allow Mercedes-Benz to equip the GLS with four-, six- or eight-cylinder engines.

Depending on the market, a hybrid version is also likely a possibility. A fire-breathing AMG model may also be available with a 4.0-liter bi-turbo V8 powerplant.

Spied: Mercedes-Benz GLS

The all-new GLS could make its world debut sometime in 2019.