At the annual Surface Event, Microsoft announced the new Windows 10X which was optimized for dual-screen and foldable phones. Since Microsoft is currently transitioning to the new Fluent Design framework, it was expected that they will implement to Windows 10X as well.
Now Aggiornamenti Lumia has discovered some new icons for Windows 10X. The new icons ditch the old design in favour of the new Fluent Design Framework and will be coming to Windows 10X. We do expect Microsoft to implement these icons to Windows 10 in the future.
— Aggiornamenti Lumia (@ALumia_Italia) October 11, 2019
For now, unfortunately, we will have to wait until late-2020 see these icons in action on Microsoft’s upcoming Surface Neo dual-screen device. We expect Microsoft to add some of the new icons to the Surface Duo as well but the chances are slim.