Additional observations:
- The software categories (i.e. curated, and presumably, adaptive apps) in the Store take a long time to populate
, but now include lots more apps than in Amber. 
[EDIT: This is only if "Show incompatible applications’ is enabled. Otherwise, normal time to populate.] -
I think charging is capped at 80% by default now.[Edit: It’s not.]
- Terminal-style keyboard seems to be the default in the terminal now, even if “English (US)” (dependent on your region) has the active button enabled.
- Selecting “Terminal” keyboard in other apps applies system-wide (as before), and does not persist after reboot (as before).
-
Calendar is very nicely adaptive now, which it wasn’t in Amber.
- There’s haptic feedback on power up now.