I would like to make a short note of the following announcement on the ConfigMgr Connect Site (https://connect.microsoft.com/site16)
System Center Configuration Manager 2007 R3 Release Candidate (RC) has been released!
As a member of the Configuration Manager 2007 R3 Open Beta program you can download at this Connection via the downloads tab.
Feedback can be provided using the Feedback tool and also available is discussions via the Newsgroups where you can post comments and ask questions.
ConfigMgr Customer team