An internal Samsung KNOX document has revealed the company's update plans for some of its smartphones. The document in question shows a list of devices that are bound to get Samsung's security app pre-installed on them and the Galaxy S4 mini and Galaxy Mega are to do so once they get updated to Android 4.4 KitKat. The document doesn't specify which Galaxy Mega (the Mega 5.8 or Mega 6.3)...
Source: http://www.gsmarena.com/samsung_galaxy_s4_mini_and_galaxy_mega_to_get_android_44-news-6932.php