https://techcrunch.com/2019/02/05/sonos-unveils-in-ceiling-in-wall-and-outdoor-speakers/

Sonos is partnering with Sonance for a new lineup of passive speakers. You can now pre-order in-ceiling, in-wall and outdoor Sonos speakers.

These are weird products as you still need to connect those speakers with a Sonos Amp. In other words, you can’t control those speakers from the Sonos app without the Sonos Amp.