We actually bought the RWD LR two days ago. The process for purchase is using their website to select the options you want while the sales associate sits there quietly waiting to answer questions.
Color choice was the only non binary option.
There was no "premium" option you describe.
Autopilot and full autonomous driving were optional and the associate said all cars are fully equipped to support both and they can be added at a later date.
Having 3 power train configurations is added complexity they might just be trying to avoid while also milking those who think they need LR for another 5k.
They told us up front the notugly rims were a % reduction in performance and cost extra. They're not trying very hard to separate fools from their money.
If I had to hazard a guess, I would say that the hardware to support full autonomous driving might no longer be included in vehicles and they'll be shipping with just what is necessary for Autopilot, assuming there's a difference.