First off, many thanks to aborne25 from twitter for providing the photos and information and second, it looks like these will be low to mid-level devices with both being manufactured in Vietnam.
Tuesday 27 July 2021
Sony WF-1000XM4 firmware update, version 1.2.6
New firmware has been released by Sony for the WF-1000XM4. Lots of users on reddit have been reporting a weird problem where the noise cancellation would cut off. Not sure if this was also that "woosh" issue but from what I have read on reddit, this update seems to fix that issue.
Sunday 18 July 2021
Possible Sony WM1-Series successor spotted online (update)
This was posted on what looks to be some social media website in China. We can see the Walkman logo in the lower right corner of the device, clearly indicating this is a new Walkman device.
Monday 5 July 2021
Sony WF-1000XM4 teardown by 52Audio
We finally have a full teardown of the new Sony WF-1000XM4, time to see what secrets it reveals. The teardown was performed by 52Audio.com. Prepare for a long post and lots of photos.