OpsMgr 2007 R2 has been released to manufacturing with a GA date of July 1st. You can download a trial now. There is an overview of this new production and a what is new document as well.
The big thing in OpsMgr 2007 R2 is the inclusion of Cross Platform Extensions. This gives you the ability to monitor UNIX and Linux using agents and basic management packs provided by Microsoft as a part of the product. 3rd parties will still continue to offer more complete management packs.
SLA (Service Level Agreement) reporting has also been included as opposed to being a bolt-on in the current 2007 release.
I’m really hoping someone from MS publishes an official guide on how to do an in-place upgrade from 2007 to 2007 R2.
EDIT:
I’ve just found a video on upgrade and deployment best practices.
And documentation can be downloaded from here (including deployment guide).
EDIT #2:
Wow, the upgrade is complex. Make sure you read all 63 pages of the upgrade guide. I’ve a funny feeling I’ll be working a long weekend for this “mini” project.