SQL Server Product Team is excited to bring you the final release of SQL Server 2012 Service Packs, Service Pack 4 (SP4). This release of SQL 2012 Service Pack has 20+ improvements centered around performance, scalability and diagnostics based on feedback from customers and the SQL Server community. These improvements enable SQL Server 2012 to perform faster and scale out of the box on modern hardware design.
In addition to improvements listed below, SQL Server 2012 SP4 includes all the fixes up to and including SQL Server 2012 SP3 CU10.
For more details, please see the release blog post SQL Server 2012 Service Pack 4 (SP4) Released!