The 4thcumulative update release for SQL Server 2012 is now available for download at the Microsoft Support site. Cumulative Update 4 contains all the SQL Server 2012 hotfixes which have been available since the initial release of SQL Server 2012. This update contains hotfixes for issues that were fixed after the release of SQL Server 2012.
Those who are facing severe issues with their environment, they can plan to test CU4 in test environment & then move to Production after satisfactory results.
To other, I suggest to wait for SP1 final release to deploy on your production environment, to have consolidate build.
Cumulative update package 4 for SQL Server 2012 is available:http://support.microsoft.com/kb/2758687