The Sony LinkBuds are here and at a cheaper price point than the WF-1000XM4. While not replacements for Sony's high-end earbuds, the LinkBuds offer a unique take on a saturated market with an open-back design. Initial reviews point towards the LinkBuds delivering better call quality than the WF-1000XM4 too.
https://www.notebookcheck.net/Sony-LinkBuds-Open-back-earbuds-presented-with-superior-call-quality-than-the-WF-1000XM4.600044.0.html
Ignoring the look of the design, which you would think will be a polarising one, touting all day comfort due to their size and weight seems like a fairly pointless claim when you would need to be taking them out to charge them up if you tried to use them all day.