Hi Everybody!
I'm a student at the University of Michigan in Ann Arbor, and we just had a trio of Tesla employees come visit to recruit new graduates. During the question-and-answer session, I asked if the nose of the final Model S was going to stay as that black plastic, and their emphatic reply was "NO". The engineer (who works in the brakes team) said that the Alpha car that was used to film the clip was assembled in an extreme rush (jokingly, he said they assembled it in a single day) and the video was shot entirely in one night, on Christmas Eve. He then said that the final, finished front would look really good, close to the original mock-up and show car. I'm going to upload the recorded sound bits to my website and give you a link when I've got it up to listen to. More details coming soon!