it's strange because not all update have this issue. I can update some free and paid apps ( over 10 update was succeful) and few (4-5)others have this problem and cannot be updated. Itunes didnt been updated since beginning of this issue.
For the free one who cannot be updated, i just deleted already owned in itunes and re-downloaded updated version again without any problem.But for my paid apps, i will need to wait That apple fix it.
I googled and i see this problem already happen in 2007 or 2008 but i just found problem report, no solution. I will try to spend couple minute to find out on google and try to call apple or contact apple expert on the web there tomorrow:
http://www.apple.com/support/expert/ and come back to tell what they said. If someone found please post !!