Microsoft has released Avalon and Indigo RC1, trying to install, but no luck as yet, the installer crashes in the middle.
“Avalon” is the code name for the presentation subsystem class libraries in WinFX. Avalon provides the foundation for building applications and high fidelity experiences, blending together application UI, documents, and media content, while exploiting the full power of your computer. The functionality extends to the support for Tablet and other forms of input, a more modern imaging and printing pipeline, accessibility and UI automation infrastructure, data-driven UI and visualization.
Download Avalon here