Microsoft has released SQL Server 2012 Service Pack 2 Cumulative Update 4, which is Build 11.0.5569. This Cumulative Update has 36 fixes in the public fix list. This is the build that you want to be on if you are running SQL Server 2012, since you should be on the SQL Server 2012 SP2 branch by now, at least in my opinion.
Microsoft has also released SQL Server 2012 Service Pack 1 Cumulative Update 14, which is Build 11.0.3486. This Cumulative Update has only eight hotfixes in the public fix list. There is no corresponding CU for SQL Server 2012 RTM, since SQL Server 2012 RTM is not a supported Service Pack.