I love questions. Ask me questions any time. I answer questions for a living.
Nothing from the 'old version' exists. I don't know what the name of this planet is, as I haven't given it one. There are more than five continents, according to the map and according to how I imagined it before the map, and they do have names, but I haven't named them yet. If you have any suggestions concerning names, I'm all ears.
The central government is, also, not the same. However, they are similar. All countries are ruled by the central government. However, certain city-states govern themselves, if they are able to (often depending on economy and armed forces). Nautilus is definitely an independent city-state that does not acknowledge the authority of the central government, because they can or do not agree with the central government's politics, or whatever other reason.
Yes, the central government would be something akin to the UN, I suppose. They aren't directly evil, but they're not 'good' either.
Kim is, then, most likely able to hear them coming. So, you can roleplay it as if he hears them before anyone else notices them. I'll leave room for that in my next post.