According to Android police, the first real update for the Tab3 7.0 is currently being pushed out for the US sprint model T217.
It carries the version number T217SVPUBNE7, is being pushed beginning today and this is the changelog:
Android version 4.4.2, KitKat
New Lock Screen Access
Media Controls - full-screen album art and media controls when listening to music
Camera Shortcut - access the Camera application right from the lock screen
SMS App Chooser - select a default application for sending and receiving SMS text messages
Restyled Status and Navigation Bars - status and navigation bars are translucent and can sit on top of apps, along with simplified status bar icons
Consolidated Location Settings - location services are integrated and more detailed by new Location menu
Expanded Emoji Icons
Wireless Printing – supports printing over Wi*-Fi and Bluetooth
Prevention Information pop-up message is suppressed.