Rumour has it that the AirPods Studio may have already entered mass production. Slated to be announced at WWDC 2020 next month, the US$349 over-ear headphones will compete with the likes of the Bose 700, the upcoming Sony WH-1000XM4 and the Surface Headphones 2.
https://www.notebookcheck.net/AirPods-Studio-Apple-s-US-349-over-ear-headphones-enter-mass-production-ahead-of-WWDC-2020-unveiling.466450.0.html