Anti-XSS library 3.0 is now RTM!!! MSDN download center is updated with the new binaries. Here is a overview of the changes in 3.0 release.
New features in this version of the Microsoft Anti-Cross Site Scripting Library include:
There are no changes to the library, so it maintains binary compatibility with the beta version. You can simply replace the previous binary with the new RTM binaries. The new installer can be downloaded from Microsoft.com download center.
Anti-XSS will be becoming the Web protection Library (WPL). Stay tuned!