Microsoft released the "
Hitchhiker's Guide to the Windows Presentation Foundation Beta 1 Release".
"This article highlights the Beta 1 release of the Windows Presentation Foundation ("Avalon"), the next-generation Windows presentation graphics subsystem. It provides a brief overview of the platform and explores new features added in this release from previous releases"
The article talks shortly about "Metro", media, speech, Typography, expander control and express applications.
http://msdn.microsoft.com/windowsvista/default.aspx?pull=/library/en-us/dnlong/html/hgtobeta1.asp