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More information is available on Microsoft Connect. Click the 'Available Connections' link and look for Windows Server Update Services 3.0 SP1 Release Candidate. Here's a brief overview of the WSUS page on Connect:

"Thank you for joining the WSUS 3.0 Service Pack 1 Release Candidate Program and we welcome you to provide feedback on the Service Pack 1 through the channels listed below. By including you in our development process, we can ensure that our products meet the needs of our customers and are reliable.

WSUS 3.0 SP1 addresses a number of product fixes and includes the addition of support for forth coming Windows Server 2008 (code named Longhorn Server).  The release notes on this release can be downloaded along with the build which provides more details on the installation."

Download Service Pack 1 and Documentation:
The downloads link on the left hand menu will take you to the download page for the following SP1 builds and documentation:
- WSUS 3.0 SP1 Beta x86 Build
- WSUS 3.0 SP1 Beta x64 Build
- WSUS 3.0 SP1 RC ReadMe
- WSUS 3.0 SP1 RC Pre Release License
- WSUS 3.0 Overview Document
- WSUS 3.0 Operations Guide
- WSUS 3.0 Step by Step Guide

Note: I'll update this post with my first impressions once I get the new build installed.