Sonos will launch Google Assistant on its smart speakers next week

Now the question I don't know
Can I run the two together in a pair so I get stereo sound with right and left channel.
Has anyone done this?

I am pretty sure this is not a supported configuration, however, yes I have. I am not 100% sure I can reproduce the steps, and am not going to undue my setup to find out. Here's something to try though.

1 - Remove GA from both speakers you want in your stereo pair. (You may want to remove GA from your whole Sonos setup, not sure)

2 - Setup your Ones as a stereo pair with Alexa configured on both speakers. You should be able to talk to both speakers at this point.

3 - Go to the room settings in the Sonos app for your pair and add Google Assistant as a voice service. GA will get setup on the left speaker in the pair, while Alexa remains on the right speaker.

I have this setup in 3 separate rooms without seeing any issue. For all three rooms, the app says that my Alexa setup is not complete, but it is functioning. I imagine completing the setup will remove GA.

Again, no guarantees that this will work for you, as I may be getting the steps wrong from memory or some other reason. I also wouldn't be surprised to see my setups start having issues with an update, either on my system or in the cloud.

Nothing will work for me, Google assistant is not in my Country yet.