Sony WH-1000XM4 upgrades detailed in early Walmart product page
 

Sony’s WH-1000XM3 headphones are due for an upgrade, and there are hints it might be worth waiting. Walmart has prematurely listed the WH-1000XM4 (via Laptop Mag) with multiple major feature additions. To start, it would finally support multiple devi...

https://www.engadget.com/sony-wh-100...152535724.html