I feel like the amiibo cards need to either be re-issued with new packaging, or just release a new series speicifcally for the Switch game. Animal Crossing has proven that the cards are a real moneymaker as they are harder to find than the figures! With Switch confirmed to have compatibility with amiibos again, it only makes sense to stick with the cards. I think they'll rearrange all of the series and make a new series of cards specifically for the "Switch" version of AC. This way, if we get new/returning villagers, they'll have their own card too. I'm just wondering how they'll go about it for the next iteration of the game.
Also, I want to see Villagers do more stuff in town. Before, like in the GCN version, you'd see villagers randomly pop out of their homes. You don't even see them leave their houses unless you take them to their house and then leave. I'd also like to see them do stuff like excercise, lean against a tree and read a book, strike up group conversations with other villagers, jump rope, paint, etc. Also, I think the mayor thing was brilliant and they should bring that back, but I also think you should assign villagers with various jobs around town, like one or more villagers water plants, another one gathers fruit for you, another one collects petitions etc.
More PWP is also welcomed. I think Main Street should be expanded to include all of the buildings from HHD, the villager jobs from those buildings, and you should be able to decorate the outside of your town similar to how you could decorate outside your Villager homes in HHD.
I'd like to see vegetation like carrots, lettuce, onions, rutabagas, cucumbers, etc. being grown and a yield of 4, but sold at a cheaper price than fruit, but it also grows faster than fruit. We can till certain areas of land to create a brown patch that allows you to plant seeds which will grow vegetables.
In terms of Villager count, I think all villagers from ACNL:WA should come back, plus the remaining cut villagers, as well as many new ones. So many around 500 sounds right. At the very least, give us Champ back lol.
I think if there is to be a new animal type, it should be for NPC purposes to run the transportation. We've had Porter do the train and trolley (he loves trains), and Kapp'n captained a bus and a taxi. It only seems fitting for the play to arrive by air, either by hot air balloon, jet plane, or helicopter. Thus, the new species of bats would be perfect for the role of working at an airport. I know people would prefer bats as a standard Villager type, but I feel as though we have enough species and I am just throwing out ideas here.
I think the village size should be huge and immersive like BOTW, but comparatively, we need a system of transportation to get to point A to point B like in BOTW or GTA where you can skip having to travel a long distance and fade to black and fade back in once you've arrived, or make it more cartoony and in AC fashion. It's hard to explain what I am talking about. I think they call this a "waypoint" system? Isabelle has a scooter called a Daytripper, so maybe she'll let you borrow it to travel.
Villagerpedia. Think of it like a PokeDex, but for Villagers. Entries are obtained through villagers you meet who move into your town, visit your campsite, meet through a Dream Town or meet in a friend's village. You get rewards to completing a specific group or species, and the Villagerpedia can also be used as a way to communicate like a phone book to either say hello or invite them to move into your town.
The campsite might be slightly different. I don't know if returning to RVs would be best, but if not, then Harvey should run a separate campsite with four tents, a campfire and other stuff as well as items for sale at his cabin. I think if RVs do return, they should be for the old figures and cards and not the new ones, if they make new ones that is.