Apple TV 4K launched almost a year ago with support for Ultra HD and HDR content (both Dolby Vision & HDR10) but among other specs that stayed the same were the size, storage capacities, RAM, and audio support up to Dolby Digital Plus 7.1. That will soon change though as a fall update to the Apple TV 4k will support immersive Dolby Atmos audio.
Apple made the announcement at WWDC 2018 today and promised free upgrades to already-owned digital movies on iTunes. The support of both Dolby Vision and Dolby Atmos is a first for streaming media players (Fire TV 4k, Roku Ultra and Nvidia Shield TV only support HDR10), making the Apple TV 4k the box solution for the coveted combination of Dolby Vision and Dolby Atmos.
Among other announcements made by Apple today were FaceTime capabilities up to 32 people, macOS Mojave (10.14) with Dark Mode for a screen that changes depending on time of day, a completely redesigned Mac App Store, and watchOS 5 with Walkie-Talkie to connect with friends.