Hopefully it's a very short-term update of some kind but I can't purchase new apps nor download previous purchases either. In app purchases aren't responding either. When I log in to my CA or NZ accounts they're working fine. Anyone else experiencing this? I've restarted my device, logged out and back in etc.
Hmm... Let me see, Today im still downloading Infinity Blade III (I already purchase this and re-download again) for about a 6Hrs. I also bought Bioshock few minutes later (succesfully) so this means i have no problem. US appstore already update now. Maybe it should work a few hrs/days for you or try all over again your method.
I had the same issue with the uk store yesterday, after about three hours I restarted my device and it seemed to do the trick, may have been coincidence or I may be a freakin genius