Perhaps a simpler explanation -- goodwill to head off the complaints about "why is my 70-75 slower than his 70-75 that is not fair." Nothing to do with AP dev.
Well, they aren't uncorking mine. Built in March this year. 6-9 months newer than some of the uncorked cars from 2016.
To be honest I'm pissed. I wasn't happy in the summer when the news about the fast 75D came on July 1st. I took delivery of mine June 28th... I also missed out on free air suspension, price reduction, guaranteed residual value and some other things. And just when I had come over my bitterness from the summer this happens.
I swear, I will sell my Tesla and just head back to BMW. I just don't handle losses very well I guess. I think Tesla treated me poorly. I bought a car for more than twice of what I had paid for a car before. Well outside my budget but Tesla doesn't protect my "investment" at all. Now my car is in free fall value wise. Every damn person who contacted me to buy my car asked if it's got the new performance, the air suspension etc etc. It's very difficult to sell without losing a ton of money.
So thank you mr Musk. Thank you very much.