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I still don't quite understand what 5.5 is all about. Even though I spent some time trying to figure it out. As far as I understand, there aren't any major changes to the visual aspect of the game. It's primarily a rebalancing and the addition of new features. (How they managed to do all this is a mystery to me, because the changes are so significant that it feels like Footman is telling the truth about the source code being available to one of them).
Yes, they use a mod for improved AI, which was created by someone who has access to the source code (but in reality, this is more of a negative aspect of 5.5, because the source code from version 3.0 and the functions from 3.1 are not available). As for everything else, it's just modifications to the executable file; they have several people in their community who are good at this.