The Apple web page on AirPods Pro 2.0 says the following about Personalized Spatial Audio in a footnote:
- Compatible hardware and software required. Works with compatible content in supported apps. Not all content available in Dolby Atmos. iPhone with TrueDepth camera required to create a personal profile for Spatial Audio, which will sync across Apple devices running the latest operating system software, including iOS, iPadOS (coming later this fall), macOS (coming later this fall), and tvOS.
Source: AirPods Pro (2nd generation) - Apple
So, the firmware can take Dolby Atmos played on ~the whole gamut of Apple devices and send customized spatial sound to the AirPods Pro 2.0. Note that HA’s are not mentioned as a receiving device but I should think HA OEMs could add that capability to receive and interpret what any Apple device is broadcasting in something approaching Dolby Atmos or at least DTS.
Further up the web page (under Personalized listening. Sound
Tuned to you., there is also the following statement about “Dynamic Headtracking.”
Dynamic head tracking now brings three‑dimensional audio to Group FaceTime calls, so conversations feel like you’re in the same room with your friends and family.
Perhaps this could work both ways. If you were wearing a lavalier mic on your chest but turned away from your web cam, your voice wouldn’t necessarily change depending on whether you faced your device screen and web cam but your own headtracking through AirPods Pro 2.0 could adjust the sound sent out according to the way you faced the screen**. And if other folks in a Group FaceTime were similarly wearing AirPods Pro 2.0, the sound from them to your ears might also reflect their head positions whether they were wearing a direct input lavalier mic or not. The utility of this seems to be the same as for iMessage and FaceTime itself. It compels everyone in your group or family to be all-in with Apple or left out (as I was for years as an Android user in an Apple family! - now I’ve finally capitulated!).
** Same if the input were coming from mics on the AirPods Pro 2.0 themselves.