Physical security keys for Apple ID: You will be able to secure your Apple ID with a FIDO-certified physical key and it will replace two-factor authentication for ‌Apple ID‌ logins.

Advanced Data Protection for all users worldwide, even though the release notes do not mention it.

Security fixes, including a serious Kernel bug that could allow an app to “execute arbitrary code with kernel privileges” and a Screen Time flaw.

Resolves issues where Siri requests in CarPlay may not be understood correctly.

Addresses an issue where Siri may not respond properly to music requests.

Fixes an issue where the Home Lock Screen widget does not accurately display Home app status.

Addresses an issue where the wallpaper may appear black on the Lock Screen.

Fixes an issue in Freeform where some drawing strokes created with Apple Pencil or your finger may not appear on shared boards.

Emergency SOS calls now require holding the side button with the up or down volume button and then releasing in order to prevent inadvertent emergency calls.

It also included bug fixes and security updates. It also adds support for the new 2nd-generation HomePod. It’s notable features include support for security keys for Apple IDs and the expansion of Advanced Data Protection to users outside the U.S.

(There is also a iPadOS 16.3.1 update for iPads). The update also improves Crash Detection on iPhone 14, Siri requests for Find My, and iCloud settings.

The latest version of iOS 16 is iOS 16.3.1 which arrived on February 13 and brought bug fixes and critical security updates.

Latest ios update