So I believe if you get this message, you’d be getting the HWD4.
“"We are taking the next step in Tesla vision. Your vehicle now fully relies on camera vision to measure distance to nearby objects, deliver active safety features, and provide Autopilot and Full-Self Driving capability (if purchased). This new approach enables improved visibility, better object detection, and greater abilities for Autopilot in the future. With this move, your Model Y is no longer equipped with ultrasonic sensors, which will temporarily impact some features."”