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They have stated that they will not be releasing mod tools. But the json files are not locked either and can be edited. It appears as though we will be able to add in missions by json editing, but they will not be releasing tools to do it.
I remember looking at the mission files in the beta, some parameters would likely be easy to change. Some stuff (like how it links into placement of unit on the maps) might more challenging.
Not sure about adding new types of missions though.