The rear half of the car is the main problem right now. The old sketch that you have is a better design than the one we were exposed to. Instead of the car ending with a similar 911 taper it is more bulbous and therefore reminded me of a stretched out AMG Pacer.

The approach Porsche should be after is one that creates the look of a sedan as opposed to another utility vehicle. The best look I've seen so far is this photoshopped car...(too bad it wasn't part of the study)