>this came sooner than I thought
Same. Debbie says that Big G has the advantage here in a way that parallels Amz's Alexa and they're going to press that advantage as fast as possible.
Somewhere around here we have an a-v thread that said cities would get levels 4-5 first because the current level of sensors and mapping would support it. Make sense and looks like that's what's happening here. I haven't looked, but I suspect Phoenix has a strong rectangular grid layout as a number of our 'newer' cities do. Boston, OTOH, will be waaaay down the list.