Rocking a Galaxy Mega 2 and/or a Galaxy Tab S 8.4 on AT&T's network? If yes, then you might see a minor update waiting for you on either device. AT&T is currently rolling out updates to both devices over the air, though neither are too important or contain changes worth getting excited about. The Galaxy Mega 2 is getting user interface enhancements, which we're guessing are related to optimization of general performance, and the AT&T Messages Backup Service. Meanwhile, the update for the Galaxy Tab S brings revised link management handling in Calendar, and nothing else.
The updates are sized at 71MB and 34MB for the Mega 2 and Tab S respectively, with build numbers G750AUCU1ANL1 and T707AUCU1ANK1. You will need to be on a Wi-Fi connection in order to grab these updates, and if you aren't already seeing a notification for a system update, try pulling them manually through the Settings » About device » Software updates menu.