They'll do an inspection, top off fluids, check the brakes, tires, etc.
I took mine in for an early oil change (4000 miles).
I used that opportunity to complain about the auto-start-stop being rough and they updated the software in the car (after which I had to re-code my enhancements). That update was not the "default to last" mode retrofit, it was updated software.
I don't know if they routinely check cars for software updates and just update them, or if they only do updates if you complain about something.
If you ask, they should so the ASS default retrofit for you. The cost is covered by BMW.