The Office 2013 May 2015 Cumulative Updates are now available, please see the links below:
Project Server 2013 May 2015 Server Roll up package:
Project Server 2013 May 2015 CU:
Project 2013 May 2015 CU:
Worth noting is that the SharePoint 2013 and Project Server 2013 updates are in Windows Updates: http://blogs.technet.com/b/projectsupport/archive/2015/05/13/sharepoint-and-project-server-2013-may-2015-updates-are-in-windows-update.aspx
Also worth noting, if you haven’t done so already, install Service Pack 1 http://support2.microsoft.com/kb/2880556 first if installing the May 2015 CU.
The Office 2010 May 2015 Cumulative Updates are now available, please see the links below:
Project Server 2010 May 2015 Server Roll up package:
Project Server 2010 May 2015 CU:
Project 2010 May 2015 CU:
SP2 is a pre-requisite for the Office 2010 May 2015 CUs.
For more details on these patches see: http://blogs.technet.com/b/projectsupport/archive/2015/05/13/project-server-2010-and-2013-may-2015-pu-announcement.aspx
As always, fully test these updates on a replica test environment before deploying to production.