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As you can read on the Official Office Sustained Enginering blog SharePoint 2013 SP1 has been released (amoung other Office products SP1s)
What's new in SP1?
SP1 provides fixes to improve general stability, functionality, and security in Office, SharePoint Server, and related products. Among the functionality improvements and changes are the following:
How to download them?
You can download them from http://www.microsoft.com/en-us/download/default.aspx or via Microsoft Update and the Windows Server Update Services (WSUS) catalog. After a 30-day period, SP1 will begin releasing as an automatic update through Microsoft Update.
For Office 365 they will be installed in the next regular update.
In theory it includes all PUs, Security updates and CUs until January 2014 (So FEB 2014 CU is not included)
The kbs for them are
Project Server (IT'S NEEDED TO INSTALL BEFORE SPS 2013 SP1 BECAUSE IS NOT INCLUDED)
Office Web Apps
BTW, I'll create an update guide as I did with SPS 2010 SP1 and SP2 to clarify the steps of installing the SP1.
Héctor Calvarro Martín. SharePoint Dev/Core. EMEA Premier Field Engineer.