I reserved 7/2015 and placed official order 3/30/2016 for 70d, with autopilot, 6 seater, accessory hitch. No PUP or SAS. I did receive the call about upgrading this past Friday with the offer for $1250 for SAS, and I could add towing package without the $500 change fee (paying for towing package of course though). I am based out of California, so perhaps why I got an earlier call. Otherwise all details were the same as those posted earlier.
I read all the model S forums about coil vs air and decided to stick with coil. I am trusting Elon when be said, for example for the model 3 that the base model would still be a fantastic car. I am counting on the coil to still be a great option, I don't want to have to worry about an expensive repair down the line and wouldn't use the SAS features for my typical commutes. As long as the coil is still a comfortable ride we will be happy. My guess is they would not even give us the option if they thought there would be a comfort or performance problem with coil for 6 or 7 seaters, so I am guessing that this is to streamline production and get as many cars out as possible.
I asked the rep that called Friday if this was just to streamline production and if the requirement would be removed in the future, he didn't think so... But of course the rep I talked with when I test drove the model X felt coil would be just fine so I'm not sure what they really know at this point...