Service Pack 1 has been released today for Office 2013, the links can be seen below:
SharePoint 2013 SP1:
Project Server 2013 SP1:
Project 2013 SP1:
SharePoint 2013 and other server related SP1:
Office 2013 and related desktop products SP1:
A list of the fixes for Office 2013 SP1:
As with all patches, deploy to a non production farm and fully test before deploying to a production system.