Microsoft has released SQL Server 2014 RTM Cumulative Update 7, which is Build 12.0.2495. This cumulative update has 41 public hot fixes, several of which look pretty significant. I have updated my recent blog post Performance and Stability Related Fixes in Post-SQL Server 2014 RTM Builds to include CU7.
It probably comes as no surprise that I think that you should be making plans to get on this build after you have gone through your planning and testing process. I still run into many systems that are running the original RTM build of SQL Server 2014, which I think is a bad situation.