Here’s a link to the Mac App Store feature story, which highlights shows, the X-Ray feature, and Downloads.

And here’s a link to the app itself, which offers a bit more detail:

App features:

• Download videos to watch offline.
• Continue to watch your favorite movie, TV show or a live event via Picture-in-Picture (PiP) while interacting with other apps or websites.
• Rent or buy new-release movies and popular TV shows (availability varies by marketplace). Multi-user profiles allow creating personalized entertainment experiences.
• Go behind the scenes of movies and TV shows with exclusive X-Ray access, powered by IMDb.
• Watch on iPhone and iPad by downloading the separate iOS app (requires iOS 12.1 version or later).
• Watch on Apple TV by downloading the separate tvOS app (requires Apple TV 3rd generation or later).

To me, this app is a huge improvement over watching Amazon Video on the Amazon web site. It’s miles more focused, without the retail clutter (do I want to buy a DVD of a movie or just watch it?) and search and show management is much better than the Apple TV interface.

This is also a big step for the Mac, a sign of recognition that a native app is worth the investment.