I honestly think the map will be sizable. For them to sell it as a priced DLC that mostly focuses on this specific part of the game makes me think that it will be a decent chunk of map. Definitely not the entire city lol but possibly a large part of that city center. Edit: The main website actually has a few pictures of Insomnia and there are definitely area type's we haven't yet. Can't post it cause of my phone being dumb but if you just look at the Royal edition section, you see a new type of neighborhood there, which seems very different from the downtown area the citadel is in.