Google is reviving wearable gesture controls, but only for the Pixel Watch 4
Pixel Watch 4 adds gesture controls, including an Apple Watch–style double pinch to answer/end calls and a wrist-turn dismissal; Pixel Watch 3 will not receive them.
Google is working on supporting new gestures on its Pixel Watches
Google will add double-pinch and wrist-turn gestures to Pixel Watches to answer calls, interact with notifications, take photos, silence calls, and close alerting notifications.