Google has finally added multi-room audio functionality to its video-based Chromecast, Google Home, and Smart Display devices
Recent Smart Display Stories
Rarely has a technology product inserted itself so seamlessly into my family's daily lives.
I really like Google's Smart Display platform, but a recent functional addition really puts it over the top.
Google is working on a new Pixel Stand accessory, could let you use the Pixel 3 as a Smart Display.