Microsoft have confirmed that there has been an issue:-
“We’ve identified a technical issue with the Windows Phone update process that impacts a small number of Samsung phones. We’re working to correct the problem as quickly as possible. But as a precaution, we’ve briefly suspended updates to Samsung phones.”
Read more: http://crave.cnet.co.uk/mobiles/microsoft-suspends-windows-phone-7-update-for-samsung-omnia-7-50002904/#ixzz1Es45Oqxi