AT&T pulls Android 4.3 update for the Galaxy S4
Samsung started rolling out the Android 4.3 update for the Galaxy S4 a while back. The AT&T version in the US also started receiving the update just last week itself. However, AT&T has already pulled the plug on the update.
Although AT&T hasn't yet provided details as to why the update was pulled but it's easy to guess why. Just recently Samsung pulled the Android 4.3 update for the Galaxy S III, citing technical issues that caused several problems on the devices that were updated. AT&T may have noticed similar problems on the devices that received the update.
No information is available as of now as to when the update will start rolling out again.