https://finance.yahoo.com/news/apple-tv-app-update-tv-streaming-170000424.html

Here are the biggest changes coming to the app.

The most important feature for the updated Apple TV app is its new Apple TV Channels. Announced at Apple's March event, Apple TV Channels are premium channels like HBO, Showtime, Starz, etc. that you subscribe to directly through the Apple TV app via your iTunes account.