One of the biggest features is a new system-wide picture-in-picture.
HomeKit users can now watch the live broadcast from supported cameras and doorbells via Siri or the Renewed Control Center.
The new software also provides support for multiple Apple Arcade users by switching users in the Control Center.
Speaking of games, you can now also use the Xbox Elite Wireless Controller Series 2 and Xbox Adaptive Controller to play games.
Other add-ons include the ability to watch 4K YouTube videos and the ability to watch 4K videos from the Photos app.