May 15, 2015 Update: SQL Server 2014 Service Pack 1 is now available for download
On Wednesday, April 15, Microsoft launched SQL Server 2014 Service Pack 1 (SP1). Shortly after release we discovered an installation issue. As a result, we have put the Service Pack downloads on hold.
SQL Server 2014 (SP1) will be re-released in the next few weeks. In the meantime, we recommend that you continue using SQL Server 2014 and its Cumulative Updates.
If you have encountered an issue during installation of the Service Pack, this article on the Release Services Blog will provide workaround steps.