Microsoft released a new version of the MTR App for Windows-based systems, version number 4.16.40. The update should be rolled out to all systems during the next days automatically. If you dont want to wait, you can use the update script: https://learn.microsoft.com/en-us/microsoftteams/rooms/manual-update
To get the new modern user interface, you have to do a manual activation for this. The process is described here:
https://learn.microsoft.com/en-us/microsoftteams/rooms/mtr-home-refresh#enable-refreshed-home-screen-design
In short terms, create a SkypeSettings.xml with the following content:
<SkypeSettings><TeamsRoomsNewExperience>true</TeamsRoomsNewExperience></SkypeSettings>
Place the file at C:\Users\Skype\AppData\Local\Packages\Microsoft.SkypeRoomSystem_8wekyb3d8bbwe\LocalState
If you want additonal to that add a new custom design to your device, you can use this SkypeSettings.xml as a template. Please note, the colours are mandatory, if you dont put them in the file, it will not be applied. Also the Theme name is mandatory. Currently, the custom theme is only applied to the Front-of-Room Display(s), it’s not changing the design of the touch control. The example.jpg has to be placed on the same directory as the SkypeSettings.xml.
<SkypeSettings><Theming> <ThemeName>Custom</ThemeName> <CustomThemeImageUrl>example.jpg</CustomThemeImageUrl> <CustomThemeColor> <RedComponent>100</RedComponent> <GreenComponent>100</GreenComponent> <BlueComponent>100</BlueComponent> </CustomThemeColor> </Theming></SkypeSettings>