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 devices. It will also be released on Windows 10 and Windows 11 very soon. It has also been confirmed that Minecraft Preview will be released on all Bedrock Edition meaning players from iOS, PlayStation, and Nintendo can finally test out the beta features.

iOS
Installing Minecraft Preview on iOS requires you to be enrolled on TestFlight, a beta enrollment application. The app is currently available to a selected audience.

Windows 10/11
It has been confirmed that the app will be available on the Microsoft Store if you have bought Bedrock Edition on it. It has also been confirmed that it will also be intergrated into the new Minecraft Launcher,

It is still possible to opt into the beta using the Xbox Insider Hub app for now.

Other platforms
Other platforms such as the PS4/5, Xbox One, Xbox Series, and the Nintendo Switch, while not really specified, the FAQ did mention that the app will be coming to all Bedrock Edition platforms.

Gallery
Minecraft Preview