SharePlay: Watch movies or shows with anyone, anywhere with SharePlay. Just start a FaceTime call on your iPhone, iPad, or Mac, then add Apple TV to share the viewing experience on the big screen. Everyone’s playback is coordinated — so you and your friends can laugh, cry, scream, or sigh at the same time.
For All of You: Browse a new row in the Apple TV app to find something that everyone in the house can’t wait to watch.
Shared with You: Movies and shows shared through Messages appear in a new row in the Apple TV app.
Spatial audio: Listen with AirPods Pro or AirPods Max for a theater-like experience with sound that surrounds you.
Smart AirPods routing: Get an automatic onscreen notification to magically connect your AirPods.
HomeKit camera enhancements: View multiple cameras around the house at the same time on your Apple TV.
Room-filling stereo sound: Pair two HomePod mini speakers with Apple TV 4K and enjoy rich, balanced sound for everything you watch.
What's unknown are whether Apple intends to bring Siri on-device processing with offline support to tvOS (Apple only mentions iPhone and iPad with A12 or better, so HomePod/HomePod mini is probably definite out). I am also hoping HDMI 2.1 features support (e.g., ALLM, QMS, VRR) are also forthcoming, but I am not holding my breath.