It was actually released earlier this month. Have you checked it out yet?

Microsoft Windows Server Update Services (WSUS) enables information technology administrators to deploy the latest Microsoft product updates to Microsoft Windows Server 2000, Windows Server 2003, and Windows XP operating systems. By using Windows Server Update Services, you can fully manage the distribution of updates that are released through Microsoft Update to computers in your network.

Step by step guides, Deployment Guides and an Operations Guide and the download are all available at http://www.microsoft.com/windowsserversystem/updateservices/downloads/WSUS.mspx