Among the changes that the update is bringing is the addition of more apps to the Multi-Window tray. Android 4.4.2 brings a whole updated set of Emoji icons to the Samsung QWERTY keyboard. And a number of new apps have been added to the device such as Isis Wallet, VZ Protect (version 2.0.0), Verizon Cloud and Audible app.
Additionally, a number of bugs have now been fixed, including one that made secure applications container Samsung KNOX, fail to work. Wi-Fi connectivity has been improved and the phone is now more stable.
You can take a look at the entire changelist by viewing the slideshow below. Verizon says that it will take 18 minutes to update the phone, during which time you will not be able to take or make calls. Your best bet is to be on a Wi-Fi network at the time of the download, and make sure that your battery is at least 50% charged.
source: Verizon via TechRadar