The Microsoft RDS team posts a new blog that explain the way to setup Single Sign On (SSO) with Windows Server 2012. The setup has been made a lot easier compared to what you had to configure with Windows Server 2008 R2.
“…Hi, I’m Sergey, one of the developers on the team that produces Remote Desktop Services. In Windows Server 2008 R2, we introduced Web Single Sign-On (web SSO), which reduced the number of times a user was asked for credentials when accessing RemoteApp programs published through Remote Desktop Web Access (RD Web Access). Enabling this was complex and difficult for users. In this post, I'll explain how easy it is to set this up in Windows Server 2012. It basically works "out of the box…”