New Chronograph watchface with a tachometer and a huge complication on the Large watchface.
Watchfaces can now be shared on iMessage and social media, and downloaded from websites and apps.
Sleep tracking and Wind Down mode for iOS and watchOS, to help with sleep.
You can now upgrade a temporary Sign in with Apple account to use your Apple ID instead, and apps will have to ask you to track you across apps and websites.
Adaptive lighting adjusts smart bulb color temperatures throughout the day, and face recognition in cameras will let you know who's at the door.
You can also pull up cameras on your Apple TV, and multi user support is now in Apple TV too.
Extensions in Safari are back, along with translation, a privacy report and a customizable start page.
Apple silicon brings the Mac to much better performance with less power consumption.
All Mac apps are now native and Xcode will support Apple Silicon, so all your favorite apps will support AS Macs as well as Intel Macs.
Rosetta 2 will allow you to run apps for Intel Macs on AS Macs from day one, and it's much faster. And there are new virtualization features too.
The first AS Mac will be released by the end of the year, while developers can start transitioning now.