On Thursday (Jul 4) Microsoft announced the forthcoming content for Patch Tuesday – Jul 9, 2013.
Number of Releases: 7
Critical Security Updates: 6 addressing vulnerabilities in Windows, Internet Explorer, Silverlight v5, Office 2003/2007/2010, Lync 2010/2013, and Visual Studio 2003
Important Security Updates: 1 addressing vulnerabilities in Windows Defender on Windows 7 and WS2008R2.
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 Jul 10, 2013, at 11:00 AM Pacific Time (US & Canada).
Register now for the July Security Bulletin Webcast. After this date, the webcast is available on-demand.
You can also follow the MSRC team at @MSFTSecResponse.
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.