<plagiarizing directly from Justin Incarnato of the OpsMgr team>
I’m very happy to announce that R2 CU4 has now shipped. The Download and KB Article are available here:
KB Article: http://support.microsoft.com/kb/2449679
CU4 is the highest quality CU shipped thus far, and resolves numerous long standing OM issues. It also significantly improves the deployment/install experience, while at the same time delivering some critical customer features such as SQL 2008 R2 Support. It’s the first CU to have been released to TAP first (Beta Release), and the second CU to integrate OM + XPlat, which has now become the expected experience for our customers.
PS: The following screenshot from Kevin Holman’s blog appears to be representative of the community reaction thus far: