I'm not entirely sure what the Knox issue is. My phone is not rooted yet, if that matters.
I received the update today around 4PM. Pre-update, My Magazine - Here and Now would CONSTANTLY Force Close causing my system to freeze for 10+ seconds. The only reason I even enabled it was to turn off the "Press Home Button to Bring Up" thing. Literally everytime I used my phone, the force close would occur.
Since the update, it hasn't happened once. I'm REALLY hoping this update fixed that otherwise I'm selling my phone and just getting the Moto X or Nexus 5.
Edit: I forgot how to grammar.