Microsoft has released SQL Server 2014 RTM CU4, which is Build 12.0.2430. This cumulative update has 54 hotfixes in the public fix list, which is a fairly large number. As usual, I think you should take a close look at the list of hotfixes, and then think pretty seriously about going through the testing and planning needed to get this CU deployed on your servers.

If you are working on a new SQL Server 2014 instance, I think it is almost a no-brainer to deploy CU4 before you go to Production.