Testing of the future GL-Klasse generation has just begun and, already, there are a lot of photos showing camouflaged prototypes running on the streets of Germany or around the company's R&D Center in Stuttgart. The last set of images were snapped yesterday; the 2013 GL-Class X 166 test model was just returning 'home', followed by a current-generation GL. The boxy silhouette of the new large SUV hints at the possibility of a further increase in the overall dimensions of the car. As we said previously, we believe that the exterior design will be an evolution, not a revolution.
See more photos after the jump!
Source of the photos >> Motor Authority
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