

So much! We've written a bunch about the new operating system, including a detailed FAQ and sections on its new user interface, Lock screen, Messages app, and lots more. As such, you won't be able to downgrade once the update is complete. IOS 10.3 beta 1 updates your device's file system to the new Apple File System (APFS). Once that's done, you'll be on the Home screen and ready to rock iOS 10.

iCloud settings will update, so give it a minute.

There's a brief bit of setup you'll need to go through, however, as the system will have changed enough that it'll need your login to complete the update. Once your iPhone or iPad reboots, it'll be running iOS 10.3. There will be a couple progress bars going across the screen. Your iPhone or iPad will reboot to install iOS 10.3.
