Android Private Compute Core
Google is introducing Android Private Compute Core with Android 12 which incorporates privacy protections directly into the OS. This security feature will allow flashing new technologies that are private by design. This will keep your personal information safe, secure, and local to your smartphone. To be more precise, this will enables features like live caption, smart reply, and other audio and language processing activities isolated from the network, preserving your privacy.
Notification improvements
One-handed mode
This is identical to the one-handed mode in iOS. Once enabled via the Settings app, this feature will bring the top half you display downwards giving easier hand handy access to buttons, icons, or other features there. However, reportedly this feature is less likely to go till the stable launch, but who knows if Google changes its mind.