I would Love to see new people in the game. New places to explore like, maybe the city or a different town. Something that would help you with the farm like a tractor that would help you with planting seeds. New plants to grow. Which one of these suggestions do you like.
The tractor isn't need and there's a mod for it, just upgrade your hoe and have junimos. I would rater see new villagers and new places but it's unlikely that CA will make major changes in the game at this point.