Some HomePod 15 beta testers have noticed new toggle options for Dolby Atmos and Lossless Audio in the newest version (beta 5). With both spatial and lossless audio being tested, it’s clear that Apple is planning to publicly release these features on all HomePods in the near future. HomePods can currently utilize Dolby Atmos when connected to an Apple TV 4K, but this update would expand the functionality beyond that specific restriction.
9to5Mac points out that these functions are not appearing for all HomePod 15 beta testers, however. There isn’t a pattern to the distribution, but if you’re running the newest HomePod 15 beta along with iOS 15, it is possible to check on the Home app. The toggles can be found in Home Settings > your profile > Media > Apple Music, if they’re available to you.