After they have been leaked early , now they are officially available: http://support.microsoft.com/Default.aspx?kbid=938979 http://support.microsoft.com/?kbid=938194 At this stage they do not seem to be available via Windows Update but they might become...
Instead of calling Microsoft for a hotfix you can now use the Hotfix Request Web Submission Form at: https://support.microsoft.com/contactus2/emailcontact.aspx?scid=sw;en;1410&WS=hotfix