An internal document has been leaked on the internet revealing that U.S. Cellular’s much-anticipated Android 4.4.2 update for Samsung’s former flagship smartphone of 2013, the Galaxy S4, will start rolling out tomorrow, Wednesday, February 19, to all carrier-branded handsets located in the United States. This upgrade ferries the latest build of KitKat in addition to several enhancements for the TouchWiz custom user interface.