Alright I asked a few people here to get an idea of how "moddable" CZ will be.
The odds of CZ having true mods created for it such as adding new guns and new bad guys or anything like that will be really low. I know that Valve has not ever released single player source code to the public in the past. I donít imagine they will allow it to be released so to answer one question.
Will CZ have mod support?
The Answer is most likely no.
However some people tend to use the term MOD more loosely than others and in this case the word MOD might be applied to things other than changes made to the game source DLL files to create a modification to the game code.
You will be able to make new missions and populate them with new static world models textures and sounds ect.
However thatís it.