They've added new villagers for every single main series game thus far, so there's no reason they wouldn't... Not sure why you brought Pokemon up because essentially they've done the exact same thing when it comes to introducing new species with each main instalment
I could recite every Pokemon, years ago, when they were around 400 strong.
Today it's absurd.
It's why I gave it up.
Too many.
That's why I bought Pokemon up.
I didn't want AC to end up with that many, it becomes too overwhelming.