Federico Viticci of MacStories has a surprisingly deep dive of this .x update, but there are plenty of gems in here. For example, the most noticeable aspect of this update may be the ability to unlock your iPhone while wearing a mask via your Apple Watch; the subtlest but, I have decided, most delightful new thing is this Shortcuts tip:
You can now also control your device’s orientation lock settings via the ‘Set Orientation Lock’ action. With this action, you can either toggle orientation lock, or you can use parameters to specifically set it to ‘on’ or ‘off’. The ‘Set Orientation Lock’ action is going to be particularly useful for all those users (yours truly included) who dislike having to find the proper toggle in Control Center.
I keep orientation lock on at all times but now, when I launch Halide, orientation lock toggles off, and then switches itself back on when I leave the app. This does seem like something Apple could provide an API to developers for — the Camera app is able to rotate its UI and the photos it takes without toggling orientation lock — but it is an excellent workaround.
This is a significant update, and Viticci’s overview is a good place to start while it is installing on your devices.