I have seen that there are a lot of topic about chromecast but not an honest answer yet from Sonos Support.
Chromecast built in support is without a doubt a must to be added !
You can do a lot of things with Airplay2, even watching that netflix series you love, but on Android/Pc/Chromebook nothing !
Chromecast will not only add something to Android heads, the possibilities with chromecast are beyond mobile phones ! Even Video beams come now with chromecast and android TV !