Mercedes SLS AMG Roadster has been on sale since late 2011 so it is a bit surprising to see it already testing with a disguised front.
The SLS AMG range (not including the Black Series) was renamed and gained the GT name last year with the addition of 12 more hp, re-tuned suspension and revised seven-speed dual clutch gearbox.
Obviously now that the first prototype has been caught there is a facelift coming soon with minor updates. The prototype pictured here has some light camouflage only on the front bumper and grille hinting at very small changes.
With the small facelift to the front there could be some done also to the interior, safety and Infotainment.
There is always a chance that there are other exterior updates planned for the facelift, but it is unlikely and probably just a minor update to improve the cars aerodynamics.