The bigger question, however, is what engine Porsche is hanging off the back. If history teaches us anything, we could be looking at one of several possibilities. For one, this could be a prototype for the updated 911 GT3 RS, carrying a modified version of the existing model's 4.0-liter flat-six, still naturally aspirated, but maybe with a few extra horses kicked in over the outgoing version's 500 hp.
For another, it could follow in the footsteps of the previous limited-edition GT3 RS 4.0, but since the existing model already boasts that displacement, this one could go a step further at 4.2 liters. But then it might not be a GT3 at all: we could be looking at the rebirth of the GT2, the primary difference between the two being the absence or presence of turbochargers. Porsche hasn't done a forced-induction GT model since the GT2 RS of 2010, and that was essentially a 911 Turbo sans the all-wheel drive and any shred of sanity.
Whatever is lurking under all that aggressive bodywork, we're looking forward to finding out. And we get the distinct feeling that it won't disappoint.