On Thursday (Jun 6) Microsoft announced the forthcoming content for Patch Tuesday – Jun 11, 2013.
You can have Microsoft's security bulletins sent directly to you:
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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 Jun 12, 2013, at 11:00 AM Pacific Time (US & Canada).
Register now for the June Security Bulletin Webcast. After this date, the webcast is available on-demand.
You can also follow the MSRC team at @MSFTSecResponse.
Number of Releases: 5
Critical Security Updates: 1 addressing vulnerabilities in Windows and Internet Explorer.
Important Security Updates: 4 addressing vulnerabilities in Windows, Office 2003, and Office for Mac 2011.
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.