It’s been a busy week for Microsoft, as well as Update Rollups for Exchange 2007 and Exchange 2010, and the first Service Pack for Exchange 2013 they have also released the first Service Pack for Office 2013.
The Office 2013 SP1 provides security enhancements, and improved compatability with Windows 8.1 and Windows Server 2012 R2. It will become available on Windows Update within the next 30 days.
The 32bit version is approx 643MB in size and the 64 bit version 774Mb in size, so definitely worth waiting to deploy it with WSUS.
Further details can be found on the Office Update blog here.
A description and download links can be found here on KB2817430.