For those who do not know, System Center Operations Manager 2007 is at Service Pack 1. The decision was made to forgo a Service Pack 2 and re-release OpsMgr 2007 as R2.
The Beta release of R2 was available on the Connect website yesterday.
Here is a link to some information on the latest release:
http://technet.microsoft.com/en-us/opsmgr/dd239186.aspx
Enhancements include better console performance, the ability to import Management Packs directly from the System Center catalog on the web and the inclusion of Linux and Unix Computers in the discovery Wizard which was until now only possible from a separate area in the Monitoring node leveraging the Cross-platform extensions.