The updated tools for the RC along with the samples are out. The samples from the prior 1.0 release will still work as well
Windows Identity Foundation Tools for Visual Studio 2012 RC - Vibro.NET - Site Home - MSDN Blogs
Samples are at the bottom : http://blogs.msdn.com/b/vbertocci/archive/2012/03/15/windows-identity-foundation-in-the-net-framework-4-5-beta-tools-samples-claims-everywhere.aspx