Those of you with a tough-as-nails Galaxy S5 Active for AT&T are probably wondering when your phones will be updated to Android 4.4.4. And you can keep on wondering, because the latest over-the-air update from Samsung keeps the phone on the same 4.4.2 build it had when it was released three months ago. But it does add... uh, some user interface changes in the default email app? Roll out the barrels!
Accidental emergency dial fixed on the lock screen
Several lower layer modem crashes and sluggishness improvement enhancements
E-mail UX enhancements
Re-activation lock improvements
To be fair, those issues with the emergency dial and modem crashes sound like they could seriously annoy at least some users. Samsung isn't saying how big the G870AUCU1ANG3 update is, but I don't think those changes could warrant more than 100MB at most. Even so, the support page recommends connecting to a WiFi network before initiating the download.
As for when you can expect a more recent update to Android itself... since the standard Galaxy S5 is still rocking 4.4.2, you could be waiting a while, and Samsung might just skip all of it in favor of the inevitable Android L update. Whenever that might happen to come.