U.S. Cellular version of Samsung Galaxy S4 receives Android 4.3, support for Galaxy Gear
Besides those changes, the OTA update includes new versions of certain apps like City ID 1.25.11, Mobile TV 220.127.116.11-265549, MobiTiles 18.104.22.168, Slacker Radio 4.0.1034, TRD 2.0.32b, WiFi Now 4.5.90, YND 22.214.171.12430059, Mobile Security 126.96.36.199 and Amazon Shopping 2.6.0.
The update is being sent out in phases, so if you haven't received the notification that the update has arrived by now, trust us, you will. You can also see if the update has arrived on your phone by going to Settings > More > System Update > Update Samsung Software.
source: Samsung via AndroidandMe