As part of their Incremental Service Modelling, Microsoft have released SQL Server 2014 Cumulative Update #7.
To apply this cumulative update package, you must be running SQL Server 2014 RTM. So it is pertinent for versions 12.0.2000 - 12.0.2494. If you installed 2014 SP1, which was released last week, then withdrawn so quickly I didn't even have time to blog about it, then you're out of luck.
The build number of the cumulative update package is 12.0.2495 . You may have to restart the computer after you apply this cumulative update package. The cumulative update package updates only those components currently installed.
This update contains 41 updates, the highlight for me being: FIX: Improved memory management for columnstore indexes to deliver better query performance in SQL Server 2014