As confirmed here SCCM 2007 R2 has just gone RTM. This is a long awaited released (by me at least!) as it delivers significant functionality lifts in two key areas:
1) Integration of Microsoft Application Virtualization (aka Softgrid) so that you can deliver (stream or transfer) virtual applications via the same infrastructure as traditional MSI apps.
2) Expansion of the OSD (Operating System Deployment) functionality to provide a solution to deliver OS's to previously unseen machines via PXE boot. This is the ideal scenario if you've just received in a bunch of new machines from your hardware vendor and you want to plug them into your network and have them build themselves.
Here's the list from Technet:
What's New in Configuration Manager 2007 R2
Topic last updated—January 2008
The following features are new to Configuration Manager 2007 R2:
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