Microsoft Security Bulletins - Advanced Notifications
Microsoft is providing a preliminary overview of the monthly security bulletins that will be issued on the second Tuesday of each month (usually around 1:00 pm PST). To help security and network administrators with planning, Microsoft will announce the patches that are going to be released a few days ahead of time. This general overview will provide the number of security bulletins that be released, anticipated security ratings and the products that will be affected.
Microsoft Security Bulletins - Advanced Notifications
http://www.microsoft.com/technet/security/news/bulletinadvance.mspx
http://www.microsoft.com/technet/security/bulletin/advance.mspx