Sony has lifted the lid on the WF-1000XM4, the follow-up to 2019's WF-1000XM3. The WF-1000XM4 contains many innovations, including LDAC support, a new V1 SoC and a charging case that supports Qi wireless charging. The WF-1000XM4 is a pricier option than the WF-1000XM3 was at launch, though.
https://www.notebookcheck.net/The-Sony-WF-1000XM4-launches-with-some-exciting-features-and-an-inflated-price-tag.544040.0.html
Alas...over a decade ago Sony was marketing the 15mm drivers in their flagship.