We don't know what any future DLC will bring quite yet, but if Breath of the Wild's extra content was anything to go by, future content will most likely enrich areas that already exist with new quests and fresh activities to explore. Given the significance of Rito Villiage as a central location in Tears of the Kingdom, I think there's a good chance we'll see some extra content for this area. Nevertheless, we'll just have to wait and see!