Microsoft has added AAC (Advanced Audio Coding) support for Bluetooth audio devices to the latest Windows 10 build released for Insiders in the Dev Channel. Microsoft has also changed the way you switch between different audio device endpoints, merging all endpoints for each audio playback device into a single entry. Microsoft also made some icon adjustments to File Explorer’s address bar’s animations and improved the touch keyboard’s animations. Microsoft announced Thursday that the Windows May 2021 Update (21H1) is now complete and prepared for release.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-is-bringing-the-aac-bluetooth-audio-codec-to-windows-10/