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I think the initial X and S Signatures came in a unique red paint, and were fully optioned w/ventilated seating, etc. Also the X initially offered the retractable spoiler.
When I pulled up to the Supercharger, I plugged in and then noticed what at a glance looked like a Model X with a car cover on, in a charging stall and plugged in. I thought that was odd. As I walked I noticed that the charge port was the Model 3 style. I immediately realized that the car had to be a Model Y. There was a white 3 parked next to it, charging. A guy got out and said “Can I help you?” Of course he was a Tesla employee who just wanted to make sure that I didn’t do anything crazy with the car. We exchanged pleasantries and I thanked him for his work with Tesla. My wife and I went to eat and when we came out out the cars were still there, with the Y still covered. We unplugged and got into our car and took about a minute getting organized to go, pulled out and I saw the Y was now uncovered and the white 3 was leaving. As we started forward the Y backed up right in front of us. I had not taken any photos earlier with the car covered because I told the Tesla employee I wouldn’t and there was nothing to see. But with it uncovered I thought it was newsworthy. First time I’ve seen a gray Y, and those wheels in real life.
I've noticed that the rear hatch's outline has been slightly altered and curves down to meet the taillights at a less oblique angle, which also means the rear fender's outline changes. It's now analogous to the 3 - less swoopy.