Microsoft confirmed that Windows XP Service Pack 3 has been released to manufacturers yesterday and that it should be available for home users through windows update on April 29, 2008.
"We are happy to announce that Windows XP Service Pack 3 (SP3) has [been] released to manufacturing (RTM). Windows XP SP3 bits are now working their way through our manufacturing channels to be available to OEM and Enterprise customers", stated Chris Keroack, Release Manager of Windows XP Service Pack 3.
"We are also in the final stages of preparing for release to the web on April 29th, via Windows Update and the Microsoft Download Center. Online documentation for Windows XP SP3, such as Microsoft Knowledge Base articles and the Microsoft TechNet Windows XP TechCenter, will be updated then. For customers who use Windows XP at home, Windows XP SP3 Automatic Update distribution for users at home will begin in early summer."