From The Microsoft Security Response Center blog:

Hello -

As part of our predictable monthly update process, we have released our Advance Notification Service (ANS) for the October Security Bulletins, which are scheduled for release Tuesday, October 12, 2010. ANS is a service that only Microsoft provides to assist customers in planning for the upcoming security bulletin release.

This month as part of our predictable security update process we are releasing 16 comprehensive bulletins addressing 49 vulnerabilities. These vulnerabilities cover Windows, Internet Explorer, Microsoft Office, and the .NET Framework. Four of the bulletins carry a Critical rating, ten are Important and two are Moderate. 

We recommend that customers review the ANS summary page for more information and prepare for the testing and deployment of these bulletins.

Next Wednesday, October 13, 2010, Jerry Bryant, group manager, Response Communications, and special guest Jonathan Ness, principle security SDE lead, from the Security Research & Defense team, will host a public webcast where they will go into details about the bulletins, and answer questions live on the air.

Register for this webcast in advance:

Date: Wednesday, October 13, 2010
Time: 11:00 a.m. PDT (UTC -7)
Register:
Attendee Registration

We highly recommend that customers register for our comprehensive alerts if you have not done so already. Sign up here: Microsoft Technical Security Notifications.

Thanks, 
Carlene Chmaj
Security Response Senior Communications Manager
Follow us on Twitter:
@MSFTSecResponse