Yeah, I've also seen articles confirming they will have exclusive items. I believe there is an article that compares the differences between old and new amiibo cards. The new ones give you thr ability to have that villager show up in a caravan, where you can buy their stuff bedore asking them to move in. The old ones don't give you that feature. So the cards with caravans on them left you buy new stuff as far as I know.