Same here, ordered yesterday on amazon, logged into samsung account, checked for update, and nothing.
What is everyone's details? My build number appears to be a build for IO attendees from what it looked like in another thread, not sure though, so maybe that's the cause as TouchWiz isn't available for the IO build
Android Version: 3.1
Kernel Version: 18.104.22.168
Build Number: HMJ37.UEKF3 P7510UEKF3