Yesterday the SharePoint 2013 SP1 (Service Pack) is released. You’ll find the downloads in this KB-Article.
The description is here. It includes the following:
- Previously unreleased fixes that are included in this service pack. In addition to general product fixes, these fixes include improvements in stability, performance, and security.
- All the monthly security updates that were released through January 2014, and all the Cumulative Updates that were released through December 2013.