Cumulative Update 5 contains hotfixes for the Microsoft SQL Server 2008 R2 issues that have been fixed since the release of SQL Server 2008 R2.

in the middle of the celebrating our new version of SQL Server that will come in the Launch event 1 week from now we need not to forget about the amazing SQL Server 2008 R2 with the CU 5 for some fixes

here’s more details about it

http://support.microsoft.com/kb/2438347