Shift from fingerprint, face-id, voice-id, etc. systems to always-on ambient systems. A security prompt (e.g. face-id to unlock) will no longer be a thing, as devices will continuously determine confidence in user identity in the background.

iPhones will re-gain fingerprint scanners (likely in the screen, possibly full-screen) and retain face-id. This in combination with voice-id and wearable devices, like the Apple Watch, will allow for "Ambient Biometric Security".