Microsoft released SQL Server2008R2 SP2(CTP) yesterday(13th May 2012).
You can download and test if if you are willing to from http://www.microsoft.com/en-us/download/details.aspx?id=29848
For list of Bugs that got fixed with this release, visit http://support.microsoft.com/kb/2630455
Cheers!
MSSQLTREK 