Directly from the Microsoft Release Service blog, here is the list of latest updates for SQL Server 2008 R2 SP2 and 2014 RTM (actually, for 2014 is also the first 😉 ):
SQL Server 2008 R2 SP2
SQL Server 2014 RTM
Please note that there is an issue that affects the packaging of CU1 that is causing a failure during slipstream installation. More details on this KB Article.
Stay Tuned! 🙂