In November 2021, Microsoft started rolling out the redesigned version of the Windows 11 Media Player to the Insiders in the Dev Channel. Now the company has announced that the redesigned version of the player is officially rolling out to the Beta Channel insiders also.
If you are running Windows 11 from Beta Channel, you can go to the Microsoft Store to get the new Windows 11 Media Player app. It is worth noting that the app will replace the Groove Music app once the installation is complete.