*** Update 5/17/2013 - That update was a little too quick and totally wrong... Thanks to Tony Blackburn of QuantumPM for putting me straight. The rollup package was released and is available at http://support.microsoft.com/kb/2737990. The note below should have been targeted at the April 2013 MSO updates and not SharePoint Server. Sorry for the false alarm and confusion everyone! ***
Quick update – I mentioned in the original April CU release e-mail - http://blogs.technet.com/b/projectsupport/archive/2013/04/11/microsoft-project-server-2007-2010-and-2013-april-2013-cu-announcement.aspx that there was a delay in the rollup package for Project Server 2013 which includes the Sharepoint Server fixes – and delay got to a point where the decision was taken to NOT release the SharePoint package for April (and therefore also not release a rollup) but hold off for the June 2013 Cumulative Update. If you are waiting for a Project Server fix then no problem – we already released the April CU just for Project Server – 2760261, but if you want the rollup then you should wait until June. If you are waiting for a specific SharePoint fix that was due in April then I suggest you talk with your SharePoint support contact about getting these earlier than June.