Microsoft has now made available and update for SharePoint Enterprise Server 2013. It's not been labeled as a cumulative update, but does provide the latest fixes and improvements for stability and performance.
The update is around 300 MB and meant to be installed for SharePoint running on Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2.
You can grab it here: Update for Microsoft SharePoint Enterprise Server 2013 (KB2920760)
P.S. The associated KB article is not quite available yet, but when it is, will be located here: KB2920760