The description for Update for Windows 7 for x64-based systems (KB976902) is "Install this update to enable future updates to install successfully on all editions of Windows 7 or Server 2008 R2. This update may be required before selected future updates can be installed. After you install this item, it cannot be removed."
So it sounds like the update is not necessary at this time, but will be in the future to support other updates? If that's the case, why is it being released already? I'm a little bit weary of installing updates that aren't critically necessary, especially when it says it can't be removed!
Any thoughts?