Treyarch has released a new game settings update on PS4 and Xbox One. The version number should be 33.18.20.* (*last number may vary by platform).
The update includes weapon nerfs and buffs, medals and challenges fixes, Arena CTF changes, and more.
On Reddit, Vonderhaar announced the weapon changes:
Vahn stated that most of the edits were very small; some changes edited the clip sizes to damage ranges; ADSs times and more.
33.18.20.* Medal & Challenge fixes; Out of Bounds exploit; weapon tuning; Arena CTF win cond. +more. Big first week. Let's go!
— David Vonderhaar (@DavidVonderhaar) November 13, 2015