Waited to deploy SQL Server 2012 until Service Pack 1 was released? Then held off because Service Pack 1 did not include important updates from Cumulative Update #3 and Cumulative Update #4? You're running out of reasons to procrastinate! The SQL Server team has released CU #1 for Service Pack 1, which should include all of the fixes from CU #3 & CU #4, as well as some others.
Relevant for builds 11.0.3000 -> 11.0.3320. Do not attempt to install on SQL Server 2012 RTM (any build < 11.0.3000) or any previous version.