Minecraft Preview

Minecraft Preview is an app players can use to test out beta features from. It works as a separate app, rather than the previous system of opt in beta content inside of the Bedrock Edition game itself.

As of now, it is currently available for Windows and Xbox, as well as limited users on iOS and iPadOS.

Development
On January 31, 2022, it was announced that the beta program would be expanded to other platforms, starting with iOS and iPadOS, in the form of Minecraft Preview app, separate from the normal Bedrock Edition app. The initial iOS and iPadOS launch was only limited to 500 users on TestFlight, which was later expanded by adding 500 more later on.

Later on February 7, 2022, Minecraft Preview was released for Xbox players via Xbox Insider Hub first, to test the migration of player worlds to the new app. The testing period was divided into two phases, for which users who don't own Minecraft can participate in, before it is officially released only to those who have bought Minecraft on Xbox.

After the Minecraft Preview releases on iOS, iPadOS, and Xbox, Windows received Minecraft Preview on February 9, 2022. Only players who own and bought the game can download and play Minecraft Preview.

Windows
The app is available on Microsoft Store and Xbox app and in the Minecraft Launcher on Windows if the user has bought Minecraft: Java Edition, Minecraft for Windows (Bedrock Edition), or Minecraft: Java & Bedrock Edition for PC, or have subscribed to PC Game Pass or Xbox Game Pass Ultimate on their account.

iOS & iPadOS
Installing Minecraft Preview on iOS and iPadOS requires the user to be enrolled on TestFlight, a beta enrollment app. The app is currently available to a limited amount of users. To get in click here.

Xbox
The app is available on Microsoft Store on Xbox if the user has bought Minecraft (Bedrock Edition) or have subscribed to Xbox Game Pass or Xbox Game Pass Ultimate on their account.

Other platforms
It is mentioned in the FAQ that Minecraft Preview is planned to be released on other platforms, with it being stated that the FAQ will be updated once the app is released on said platforms.

Trivia

 * The only Splash that can be seen in game is "Preview!!!".