The one flaw there is that there has already been two North American scenery packs with European themed sets and predominantly North American animals.
The Arctic pack isn't remarkably North American imo, like you don't say "oh yeah this is a North American centered pack" when you see it, so I think they can pass another one. I don't like the idea of a NA scenery pack centered about lame temperate NA animals tho.
The current wishlists for NA aren't even wishlist any more, they are just literally just naming the few large species in the continent left unrepresented. Where is the appeal in that? They're the low appeal leftovers, a goat, a deer, a bear. Only people who really want those specific species would buy a pack with those. Walrus, musk ox, sea otter, arctic hare, canada goose, even the vancouver marmot or the possum are way more appealing species that would be way more fun and engaging to have in the game.
Regarding scenery itself yes, the native american theme is still missing and I really hope we get something from the Pacific northwest as I usually add in my wishlist, I think the best way to implement this theme is to combine in with wood cabin pieces. Regarding totems they are kind of a tricky aspect because totem poles are sacred and their portrayal in popular culture for decorative purposes is usually offensive and disrespectful. I think the portrayal of native american culture in games being a pretty sensitive matter might have played a role on why the game doesn't have that theme yet, I expect they approach it the same way they did with the Australia pack if they do it.
My commentary on other themes people have mentioned in the forums:
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Colonial/latin/central american theme. Normally I would say yes, but right now I will say no because I want an animal pack for Central/South America and I think it's highly unlikely that they will make 2 packs centered about that region this year when big sellers from at least 3 other themes (mountains with markhor and pallas cat, NA with muskox and walrus, africa with secretary and baboon) are also potential packs. Pass.
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Mongolian or Russian themes, besides that I have never seeing anyone asking for such themes, the Eurasia pack clearly indicates they aren't going to give us those. Hard pass.
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Nepali theme. not sure, I think there was some requesting in the early times of the game? But honestly I couldn't care less about another Asian theme. Pass.
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Farm theme. No. Use conservation and aquatic.
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Aquarium / Aviary theme. Not happening but they would be cool.