Pixel Watch users get some love too; one-handed gestures now work on the Pixel Watch 3 (not just the newer models), and the watch can alert you if you leave your phone behind and can automatically lock the phone when the Bluetooth connection is broken;
certain watch-phone pairings also enable faster identity checks for sensitive actions.
The original Pixel Watch receives a modem update that includes bug fixes intended to improve E911 emergency dialing behavior.

Not seeing the update yet? No worries, it's rolling out in stages.
You can check manually by heading to Settings > System > System Update on your device.