Last week, AT&T started pushing the KitKat OTA to Samsung Galaxy S4 Active owners on its network. Looks like that was a short-lived rollout, as the company has now halted the update, explaining that it is working with Samsung to improve the OTA.
Seems like that's something could've been done before the update actually started rolling out, so the odds are that something is actually broken and both companies are just staying mum about it. Here's the statement given to us by Samsung:
The software update for Samsung Galaxy S4 Active is temporarily on hold while AT&T and Samsung look into potential improvements.
Either way, if you're a GS4 Active owner and are still waiting on the update, that's why. Once it starts rolling out again we'll be sure to let you know.