Waymo software update to go with expansion:
Source: Waymo One expands another 45 square miles in Metro Phoenix - AZ Big Media
The part about audio and visual cues to communicate intent with road users is especially interesting to me. This should help a lot in various interactions.
Waymo is frequently seen on the the I-202 freeway near Tempe with an employee in the driver's seat. Maybe positioning cars or possibly prepping/testing for future freeway use.