Microsoft SQL Server 2008 R2 Service Pack 2 has now been released and can be downloaded from the following link:
http://www.microsoft.com/en-us/download/details.aspx?id=30437
Important Note
If you are upgrading from SQL Server 2008 R2 SP1 Cumulative Update 6 to SQL Server 2008 R2 SP2 then you must apply a post-SQL Server 2008 R2 SP2 cumulative update after you upgrade to SQL Server 2008 R2 SP2 to obtain all the fixes.
Cumulative update package 1 for Microsoft SQL Server 2008 R2 Service Pack 2 can be downloaded from the following link and should be installed straight after you have applied Microsoft SQL Server 2008 R2 Service Pack 2