The current-generation M-CLass (W166) went into production in 2011 and now roughly three years later Mercedes has started work on the M-Class facelift.
The M-Class facelift prototype was caught testing in South Germany with a black and white camouglage. The front is heavily disguised, hinting at bigger changes.
While it is hard to tell what and how much will be changed, the camouflage looks to be hiding a revised bonnet, new headlights, new grille and new bumper. The front grille already reveals little of the new frame.
The rear looks identical to the current model, though we can expect new exhaust tips and even new light graphics there.
Interior is also well covered, hiding possible updates to the centre console, controls and the touch screen.
There are probably bigger updates under the bonnet as well, with improvements to performance and fuel economy.
The updated M-Class is expected to debut in late 2014 or in early 2015.