Thanks to CountryKING for posting this in our BPN
Those wanting to check out the latest and greatest Windows Update are being given the opportunity to help test the site by Microsoft. Using this link users can sign up to the beta and use it on their Windows XP machines. We haven't confirmed whether this works on Windows 2000 machines at present.
If you're interested in signing up to the beta then check out the site on a machine other than Windows XP SP2 Beta.
Screenshot: >> Click here <<
View: Windows Update v5 Beta
News source: Neowin's BPN