Pretty straightforward question. Personally, I'd love a patrol in an iconic "ancient" city, such as New York, Hollywood, Tokyo, London, etc. I think it would be super cool to explore post-apocalyptic versions of cities that we're already familiar with. Also, a large patrol area filled with tons of tight corners, streets, buildings, and whatnot would be a nice mix-up from all the open areas we have now.
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They originally advertised the "drowned swamp of Chicago." There's still a picture of it on certain versions of the game box. So that seems like the easiest to finish up and add. Mumbai is also teased in a few places. Otherwise, I want a patrol mode right outside the City, along the Wall. We keep hearing about the Fallen being "at our walls," and we only fight them at the Cosmodrome wall, miles and miles from the City.