I predict we get nothing in the way of creature comforts. Tesla's focus is going to be on Model 3, Gigafactory, and AP software.
The Model S is four years old and still doesn't even have vanity mirror lighting. You seriously think we're getting rear climate controls?
The Model S has been continuously acquiring new luxury features since its introduction - the intro of Model 3 makes it even more important to keep moving it upmarket. So yes - at some point rear climate controls for sure - and probably vanity mirror lighting as well. They keep checking off luxury feature boxes - slowly but surely and steadily.