Mystery Porsche Cayman shooting brake mule smells like a hoax?

We're not sure what to make of this viral video that popped up on the Top Gear website.  The video appears to portray a shooting brake version of the Porsche Cayman, but we are definitely skeptical.

Top Gear seems to think this car could be either a variant of the next Cayman, a turbo model, or a special edition.  We're not so sure.  Here's why:  If you take a hard look at the rear (around the :10 in the video), you see that the extension appears to have been tacked on at the rear.  Additionally, we would be surprised to see top-quality reflective mirror tinted glass used all the way around a test mule.  Our guess is that this prolongation was either physically built with some kind of cardboard or polystyrene foam and taped into place, or some crafty video editor extraordinaire digitally built the car frame-by-frame in Photoshop.

Are we mistaken, or is the car back to its normal shape at :14 when the camera quickly snaps back for one last peek?  Give us your thoughts in the comments below.

Big thanks to WCF reader Bill for sending in the tip.