System Center Configuration Manager (aka SMS V4) is now Release Candidate
The Microsoft SMS homepage is touting the RC for SMS V4 (build 5831)
System Center Configuration Manager 2007 Release Candidate Now Available
Release Candidate (RC) 1 of the next release of Systems Management Server (SMS), entitled System Center Configuration Manager 2007, is now available for download. With major investments in simplicity, configuration, deployment and security, Configuration Manager 2007 dramatically simplifies system deployment, task automation, compliance management, and policy based security management allowing for increased business agility.
You can fetch it from the Microsoft Connect website
If you're an SMS Admin and NOT played with SMS V4, due to it being beta-code, then i'd definately recommend bringing this down and installing in to a Virtual Environment as the code base won't change too much between RC and RTM. I believe it's pretty much feature complete but i've not poured over the release notes yet.