Microsoft has released SQL Server 2012 SP2 Cumulative Update 3, which is Build 11.0.5556. This CU has 34 hotfixes in the public fix list. If you are running SQL Server 2012, this is the build you should be planning to get installed, after you have done your testing and planning for the installation.
They have also released SQL Server 2012 SP1 Cumulative Update 13, which is Build 11.0.3482. It only has 10 hotfixes in the public fix list. Personally, I think you should be planning to move from the SP1 branch to the SP2 branch sooner, rather than later. The RTM branch of SQL Server 2012 has been retired.