It's ready to download August 2013 CUs for SharePoint 2013
SharePoint 2013 (Build 15.0.4535.1000 )
- SharePoint Foundation 2013 (MSF) August 2013 CU - KB 2817517
- SharePoint Server 2013 (MSS) August 2013 CU - KB 2817616
- Office Web Apps Server 2013 (MSS) August 2013 CU - KB 2817521
- Sharepoint Designer 2013 August 2013 CU - KB 2817507
After installing the updated you should run the SharePoint Config Wizard in every server of the farm.
If SPS 2013 installed you must only install the SPS 2013 CU because it includes the Foundation one.
Héctor Calvarro Martín. SharePoint Dev/Core. Microsoft Support Escalation Engineer for EMEA