The very first cumulative update (CU) for SQL Server 2012 with SP2 has been released and is now available for download from Microsoft.
Each CU is truly cumulative in that it is a large hotfix that pulls together all previously released hotfixes into a single distribution. When customers need to apply the latest fixes, they only need the very latest CU. Hence, CU1 contains all hotfixes in the initial release of SQL Server 2012 SP2 as well as all hotfixes in SQL Server 2012 SP1 CU10.
You can review the list of over 40 fixes included in CU1 here: Cumulative Update 1 for SQL Server 2012 SP2
That page also includes a link with which to obtain CU1.