The SharePoint 2013 January 2016 Cumulative Updates have been released:
SharePoint Foundation: https://support.microsoft.com/en-us/kb/3114492
SharePoint Server 2013: https://support.microsoft.com/en-us/kb/3114497
Project Server 2013: https://support.microsoft.com/en-us/kb/3114493
Office Updates: https://support.microsoft.com/en-us/kb/3131245
Consider using the SharePoint Patch Cmdlets available at SharePoint Updates for your farm!
