FCC filings submitted by Sonos in March suggest that the company is working on a new speaker, potentially a follow-up to the Playbar. The filings, which were first spotted by Variety, reference model number S14. The device will reportedly incorporate an HDMI port, which would be new for the Playbar. (It previously relied on an optical in port.) The label filing, which you can see below, depicts a microphone. This probably means the mysterious speaker will ship with support for Amazon’s Alexa voice assistant, just like the Sonos One from last year.
This is the label filing; it looks similar to the Sonos One’s device interface:
Although most publications — including German website iFun, which seemingly found a graphic depicting the device — speculate this might be an update to the Playbar, the label filing depicts a larger square device, meaning it could be an entirely new speaker or maybe an update to the Playbase, although that was just released last year, so it would be a fast turnaround for a new model.