Microsoft's Security Response Center has provided advanced notification of the patches that are expected for release next week as part of the September Security Patch Release.
Each of the five patches scheduled for release next Tuesday are for a different system component:
One Critical patch for Microsoft Windows
One Important patch for Visual Studio
One Important patch for SFU (Services For Unix)
One Important patch for MSN / Live Messenger, and
One Important patch for SharePoint Server / Windows
There hasn't been much discussion at this stage about the potential content of the patches, though it is known that there is active malware targeting various weaknesses in the MSN client.