Congratulations to the WinFX teams. The WinFX runtime components have passed the Windows Quality Gates and are now included in the main Windows Vista build tree. This means every release of Vista after the 5231 build (October CTP) will have a corresponding WinFX build. The process of getting into the main Windows tree is a so-called Reverse Integration (RI).
Probably one of the things making this possible is that from now on every Windows Vista build includes the RTM version of .NET 2.0. Scott Guthrie mentions an ASP.NET sample built using the final release of VS 2005 and ASP.NET 2.0 on his blog. So .NET 2.0 has probably been declared "gold".
I wasn't too happy to discover that WinFX wasn't part of Windows Vista Beta 1. Now I hope that WinFX will be installed by default on Windows Vista just like the .NET Framework. This will make deployment of WinFX applications easier on Vista. Also let's hope Vista will include some WinFX applications out-of-the-box.
Raymond Chen's post on an RI makes me really curious about what his team has been working on. If you read his blog you can guess that it is definitely not based on managed code and it has something to do with the shell. Could it be the Vista Sidebar?
I am very much looking forward to the next CTP of Windows Vista.