An update will be coming soon for, appropriately enough, Windows Update and Microsoft Update. The update will appear in late August, and it will take a couple of months to complete the rollout.
Microsoft wrote in the TechNet blog, "This update will not change your current Windows Update or Automatic Updates settings. It will improve the user interface for Windows Vista and Windows Server 2008 computers running Windows Update, adding a more visible and detailed description of updates as well as improvements in how users are notified about service packs. This update will not change the look and feel of Automatic Updates."
The update is mandatory for those who wish to stay up to date with the latest patches and fixes. Grabbing the update is easy as it will come as a part of Windows Update. Keep an eye out for it starting next month. Read more about it here.
this isn't for win XP
Doesn't sound like it will change XP at all, I would welcome a more detailed explanation of patches on the machine though :)