I haven't been following this thread, and don't know what wild conclusions others are batting around about the mule(s). Looking at the video and pictures that have been posted, the one I saw today sure looks like the pictures and video posted, and was driving on the exact same route. That much I can confirm. As for everything else, my 20 seconds of driving next to it and passing it were hampered by trying to keep my eyes on the road and on surrounding cars. Anyway, the rear of the car is really what got my attention when I first saw it -- and this was before I even looked at any of the pictures others have posted. My first reaction was -- is this really the way the production cars are going to look? The rear of this car just looked really odd and made me think that the driver would not have much if any visibility through the rear hatch. It wasn't ugly or anything, but it just looked odd. My impression might have been amplified as a result of part of the rear window being covered up (?)(just speculating based on one of the pictures posted).
SFOTurtle, your input is greatly appreciated, please don't be discouraged if not all find it as useful as others. To clarify, there are a few different "camps" (for lack of a better word) on the Model X forum, some adopting a wait and see attitude and not wanting to draw conclusions from mules and reminding to be cautious, and another camp (of which I guess I am a prominent example, I find the previous approach overly cautious) who have more interest in dissecting these kinds of details and facts about the mule(s) and then attempting to draw speculative conclusions from those.
Sometimes these views, while both perfectly respectable, clash. IMO it has been a bit of battleground, really. Both sides have, of course, a right to their opinion and view. Time will tell what the Model X will look like, of course, and whether or not the dissecting got us any closer to knowledge any sooner - or not.
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FWIW, I agree with the notion that this is not further proof of production Model X features, but it seems further proof (assuming trust in posters) of features of this particular Model X mule because in addition to photos and video we now have an eyewitness account. What it means for production is, of course, speculative. Absolutely.
As for the mules vs. RCs wording, in my messages above I lumped them together - so when I said mules, I talked about pre-release vehicles of all kinds - excluding 2012-2013 prototype(s). I concede it was a hasty and an inaccurate way to put it, but just to clarify that bit.
Words and text are hard, as can be witnessed above too.