Hears a thought, is there a reason these "leaks" got into public domain, maybe in order to help those who want android 4.3 without Knox issues? My minds gone blank, I think the first leak didn't have Knox bootloader but second did? Maybe a deliberate act to give clues to what makes it tick....
Just thinking out loud here.
As I haven't touched any firmwares other than stock myself I'm not sure for sure but maybe there isn't enough huge differences between leak and official to worry about official with Knox?
Sent from my GT-I9505 using xda app-developers app
Update: 17th november 2013
Samsung G S4 stock BMG4 + root
with cf-auto root + philz recovery.
HTC Desire HD
(Hboot 2.00.0029 AND S-OFF)
SVHD V 2.1.0
Retired HTC Legend