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The game appears to me like it's being refit for modding support, with internal documentation by Innoxia (in the first file of each type, alphabetically). At the moment, I've been able to make items and insert icons (for personal use only so far), as have several modders, and several modders have made races as well, and non-compiled scenes and stories appear to be in the works if not at least partially available. This is not to say that it's perfect by any means, but it looks as if the game is reasonably on its way to being a framework on which to hang the content as you've described Skyrim.