I got it and I am now sure what all it does.
First, broke the Wifi connection, unable to download apps from Google Play with an strange message that I "dont have enough storage available", and I have 24 GB free plus 61GB in Ext Storage. Cleaned Cache, reboot and still the same. Called ATT Support and complaint, one of their tech support, send reset commands to optimize the imei and after rebooting again, phone works fine for the last hour.
New fixes? I don't see the Knox error anymore.
P/D: They told me that this is a prep package update for Android 4.4 Kik Kat that starts rolling out tommorow for us.