On Thursday (May 9) Microsoft announced the forthcoming content for Patch Tuesday – May 14, 2013.
You can have Microsoft's security bulletins sent directly to you:
To receive automatic notifications whenever Microsoft Security Bulletins are issued, subscribe to Microsoft Technical Security Notifications.
Microsoft also hosts a webcast where they discuss the releases, typically the Wednesday after Patch Tuesday:
Microsoft will host a webcast to address customer questions on the security bulletins on May 15, 2013, at 11:00 AM Pacific Time (US & Canada).
Register now for the May Security Bulletin Webcast. After this date, the webcast is available on-demand.
You can also follow the MSRC team at @MSFTSecResponse.
Number of Releases: 10
Critical Security Updates: 2 addressing vulnerabilities in Windows and Internet Explorer.
Important Security Updates: 8 addressing vulnerabilities in Windows, Windows RT, Lync Server 2013, Lync 2010, Communicator 2007 R2, Word 2003, Publisher 2003/2007/2010, Visio 2003/2007/2010, Windows Essentials 2011/2012
Updates are typically released by Microsoft at 10am PT (6pm UTC).
Configuring WSUS servers to synchronize relative to that time can be helpful in expediting availability of these security updates.