The April 2014 Cumulative Update for SharePoint 2013 has been released. Note that SharePoint Server and Project Server now have two CAB files in addition to the standard EXE.
SharePoint Foundation: http://support.microsoft.com/kb/2863892
SharePoint Server 2013: http://support.microsoft.com/kb/2878240
Project Server 2013: http://support.microsoft.com/kb/2880484
Office Web Apps Server 2013: http://support.microsoft.com/kb/2863899
Office 2013 April 2014 Cumulative Updates: http://support.microsoft.com/kb/2953733