The HomePods update is rather mysterious – all Apple says is that it includes performance and stability improvements – but the Apple TV gets some great, specified new features.
The most fun new feature is the improved Bluetooth and USB game controller support, which adds lots of new models including Nintendo's Switch Joy-Cons and the Switch Pro Controller too. If you haven't already tried using controllers on Apple TV it completely changes the Apple Arcade experience, especially on faster-paced games such as platformers. There's also a new Buddy Controller feature that enables two friends to play as one.
The update also adds HDR10+ support to the Apple TV app and some new features for navigation and fitness.
tvOS 16: more new features
The tvOS 16 update also adds improved accessibility features, support for personalised Spatial Audio via your iPhone, My Sports for following your favourite teams across your Apple apps and improved integration with Apple Fitness+, Apple's subscription-based fitness service.
The changes here aren't as significant as the ones to iOS, but they're still worthwhile. As ever, if you've got automatic updates enabled your Apple TV and your HomePods or HomePods mini should install the update without any help from you, but if not you can update manually from the Settings app on your Apple TV and the Home app on your iPhone or Mac.