- Built-in authenticator: Generate verification codes needed for additional sign-in security.
- iCloud Private Relay: It ensures that the traffic leaving your device is encrypted so no one can intercept and read it. Then all your requests are sent through two separate internet relays.
- App Privacy Report: A section in Settings lets you see how often apps have accessed your location, photos, camera, microphone, and contacts during the last seven days. It also shows you which apps have contacted other domains and how recently they have contacted them.
- Share current location: Developers can let you share your current location with a customizable button in their apps. It’s an easy way for them to help you share your location just once, without further access after that session.
- Locate when powered off/erased: Locate your devices using the Find My network even after they have been turned off / erased.
- ID/Keys in Wallet: You can add your driver’s license, state ID, office badge, Hotel and Home keys to Wallet on your iPhone/Apple Watch.
- FaceTime on the web: Invite anyone to join you in a FaceTime call via links, even friends who don’t have an Apple device.
- SharePlay: Bring movies and TV shows into your FaceTime calls and enjoy a rich, real-time connection with your friends while watching the same content.
- Hide My Email: Hide My Email allows you to create unique, random email addresses that forward to your personal inbox so you can send and receive email without having to share your real email address.
- Software Updates: iOS now offers a choice between two software update versions in the Settings app.
- Downtime on demand: Turn on downtime on demand. During downtime, only phone calls and apps you choose to allow will be available.
- 5G preferred over Wi-Fi: iPhone will automatically prioritize 5G when Wi-Fi connectivity on networks you visit occasionally is slow, or when you are connected to captive or insecure networks.
- Custom email domain: Personalize your iCloud Mail address with a custom domain name, and invite family members to use the same domain.
- Digital Legacy program: It allows you to designate people as Legacy Contacts so they can access your account and personal information in the event of your death.
- Focus: Match your devices to your mindset with Focus. Automatically filter notifications based on what you’re currently doing. Turn on Do Not Disturb to switch everything off, or choose from a suggested Focus for work, personal time, sleep, fitness, gaming, reading, or driving.
More details on iOS 15: https://www.apple.com/ios/ios-15-preview/features/