A couple more observations. The volume bar is now on the right side of the screen, next to the volume buttons. It also allows direct access to sound settings. I don't mind this as it feels more intuitive to me. If you long press the power button, now there's an option to take screenshot. I like this since I don't have to fumble again with two hands to take screenshot.
A big change is split screen. Previously, you can just long press the overview button to use split screen. Now you have to tap the overview button (or swipe up from the pill, if you use that), then long press on the icon on top of the app, then select split screen. If you use split screen a lot, this change is annoying to say the least.