This is a user’s forum.  Although Sonos sometimes posts here, you are better off checking the release notes links and release announcements here:

https://support.sonos.com/en-us/article/the-new-sonos-app-and-future-feature-updates

To quote your thread title/question “Does anyone at the company know when the downgrade option will become available?” I have to ask: What downgrade option? When/where was it offered? 
 

I believe the OP is after the downgrade-speaker-fimware-to-S1 feature, that went awol in the new mobile app.