Spy Shots: Porsche GT caught under wraps?

Autogespot procured a couple of shots showing a mystery vehicle cloaked under a car cover at the Porsche factory in Stuttgart, and just judging by the lines, the rear overhand and the long hood, it certainly doesn't look like typical 911 fare.

The rear bumper is what confuses us the most, and seemed to give Autogespot the idea that this is a prototype for the Porsche GT/928-revival, supposedly based on the upcoming Panamera. We think that's a stretch, but we'll let you speculate below.

Thanks for the tip, Bjorn!

[Source: Autogespot]