I've seen multiple ideas about doing more than houses, that would be cool to add new areas, for example one near a river where you can flip cabins or small boats where people live, the countryside with farms and windmill, mountains with tree houses and cabins, citycenter with flats, hôtel and old buildings (i've seen churches mentionned, that would be cool !)
Maybe even another collab dlc like shrek with the swamp (as a house we have to buy for example) or steven universe beach house with hidden rooms