RC:

Porsche seems to test the 991 and a possible Panamera Coupe under the "look" of the current 911, so I wouldn't read too much into these cars from the looks only.

Why would Porsche move the side mirrors and use a lot of camouflage if this was just the current design? The Panamera turned out to be pretty much the car that the mules suggested and I think we'll see the same thing here: this is the actual 991 hiding the new lights and a few other details.