Recently, Microsoft announced the Preview3 release of Windows UI Library (WinUI) version 3. WinUI 3 is an evolution of the UWP/XAML platform, that decouples the XAML UI framework from the Windows OS.
WinUI 3 is the next generation of native Windows UI and consists of all the major UX layers of Windows 10 decoupled and shipped as a standalone solution. WinUI 3 Preview 3 is a pre-release version that works with Win32 and UWP apps.
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Source: Microsoft
Preview 3 brings both new and improved functionality, along with significant bug fixes. The release is intended for early evaluation and to gather feedback. You should not use it in a production environment.
New features and capabilities in Preview 3 include ARM64 Support, Drag and drop inside and outside of apps, RenderTargetBitmap, Improvements to tooling/developer experience, and more. The release also features MRT Core Support, which makes apps faster and lighter on startup and provides quicker resource lookup; and Custom cursor support.