https://techcrunch.com/2021/06/07/apple-tv-to-support-using-homepod-mini-as-speakers-among-other-updates/

Apple didn’t announce that rumored combined Apple TV device that would combine the set-top box with a HomePod speaker during its WWDC keynote, but it did announce a few features that will improve the Apple TV experience — including one that involves a HomePod Mini. Starting this fall, Apple said you’ll be able to select the HomePod Mini as the speaker for your Apple TV 4K. It also introduced a handful of software updates for Apple TV users, including a new way to see shows everyone in the family will like, and support for co-watching shows through FaceTime.

The co-watching feature is actually a part of a larger FaceTime update, which will let users stream music, TV, and screen share through their FaceTime calls. The Apple TV app is one of those that’s supported through this new system, called SharePlay. It will now include a new “Shared with You” row that highlights the shows and movies your friends are sharing, as well.