Minecraft Preview

Minecraft Preview is an application players can use to test out beta features from Bedrock Edition. It works as a separate application, 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 limited users on iOS/iPadOS devices, and on Xbox. It will also be released on Windows 10 and Windows 11 within a few weeks.

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 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.

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

Windows 10/11
It has been confirmed that the app will be available on the Microsoft Store if the user have bought Bedrock Edition on it. It has also been confirmed that it will also be integrated into the new Minecraft Launcher for Windows, and be available in Xbox Game Pass.

Xbox
The app is available on the Xbox Insider Hub. During the first testing phase (the phase currently in), Xbox Insider players who don't own Minecraft can also participate.

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.