I kinda hope so, but at the same time I really don't.
I kinda have an idea for how it could work. Maybe they could release one, and you could connect it your 3DS town and visit it via the Switch game, allowing you to interact with your 3DS town in full HD, and still have all the new areas and features in a seperate part of the town. Kind of like a Mario Odyssey, open-world style game, where your main town from the 3DS is accessible via a gate like in City Folk, and everything else is brand new and exclusive to the Switch.
Or maybe they could just continue updating New Leaf with new stuff, which I personally think would be the best option.
I kinda have an idea for how it could work. Maybe they could release one, and you could connect it your 3DS town and visit it via the Switch game, allowing you to interact with your 3DS town in full HD, and still have all the new areas and features in a seperate part of the town. Kind of like a Mario Odyssey, open-world style game, where your main town from the 3DS is accessible via a gate like in City Folk, and everything else is brand new and exclusive to the Switch.
Or maybe they could just continue updating New Leaf with new stuff, which I personally think would be the best option.