The release of the WH-1000XM4 is almost upon us, at least according to the publication of more retailer listings and even a video review. Sony appears to have made some minor changes from the headphones that it released two years ago, which is not necessarily a bad thing. Call quality apparently remains unchanged, though.
https://www.notebookcheck.net/Sony-WH-1000XM4-Amazon-France-MediaMarkt-listings-drop-early-for-new-premium-ANC-headphones-as-review-appears-online-ahead-of-release.484324.0.html