December 2013 CU for SharePoint Server 2013 is planned to be released in a couple of days.
In case you are only interested in December CU for SharePoint Foundation 2013 or Office Web Apps Server 2013 you can already download it from here:
- KB 2849961 - SharePoint Foundation 2013 December 2013 CU
- KB 2850013 - Office Web Apps Server 2013 December 2013 CU
The Full Server Packages for December 2013 CU are available through the following links:
- Download SharePoint Foundation 2013 December 2013 CU
- Download Office Web Apps Server 2013 December 2013 CU
As announced March 2013 PU for SharePoint 2013 defined a new baseline for all future SharePoint fixes - so ensure to install March 2013 PU before installing SharePoint 2013 December CU.