https://www.cnet.com/news/sonos-looking-to-add-smart-headphones-to-its-lineup-report-says/

Like its in-home Sonos Beam and Sonos One speakers, the headphones will reportedly "work with multiple music services and digital assistants" but other details were scant. The company is in the process of adding Google Assistant to the existing Alexa integration on supported devices.

While Sonos is a leader in multiroom audio, the premium headphone market is crowded, and dominated by established brands such as Bose, Beats, Sony and others, so a new headphone would have to offer some sort of competitive advantage. One would hope that it would have both Bluetooth and a home wireless component that would allow you to add to your Sonos network at home.