Samsung KNOX consists of a number of work related applications placed inside a secure 'container' that prevents the applications inside from being infected by malware and viruses. The applications include email, a browser, contacts and a calendar to name a few. Tapping on the KNOX icon secures the apps and starts the program. Another tap returns the phone to its normal functionality.
Based on the leaked document, it seems that those with the Samsung Galaxy S III mini will not be receiving the consumer version or the enterprise version of KNOX and the phone will most likely never see Android 4.4. As for the other devices on the list, We would expect KitKat to end up on the Samsung Galaxy Note 3 (which was preloaded with the KNOX software), the Samsung GALAXY Note II, the Samsung Galaxy S4 and the Samsung Galaxy S III. The latter three models will receive Samsung KNOX after they are updated to Android 4.3.
Once Samsung KNOX becomes available on a model, the software will come pre-installed on future versions of the device. In China, only the KNOX launcher will come pre-loaded. Opening it up will download the appropriate files. There is also a chance that a carrier bought model will have the feature locked down by the mobile operator.
Leaked document shows Android 4.4 is heading to the Samsung Galaxy Mega phones and the Samsung Galaxy S4 mini
source: SamMobile via UnwiredView