Due to hit the market in 2015, our spies think what we're seeing here is the new GTS variant, which, following the evolution of the last-generation 911, will make its debut on the facelifted car. Featuring the wider rear haunches of the all-wheel-drive Carrera 4, the GTS should enjoy a slight power boost, to 408 ponies.
Aesthetically, there are some additional vents in the rear bodywork, along with a revised front bumper and tweaked day-time running lights. The taillights get some attention as well, and will likely grow over the current car's skinny rear lamps.
We have five images of the new car testing up top. Let us know what you expect from the facelifted 911 down in Comments.