You know what this game desperately needs? Special orders.
Right now we have a classic mode that, while amazing, does not have any random elements, as well as a story mode that is probably the same every time as well. It's missing a really randomized experience, and that's what special orders was perfect for. Not to mention it's one of my favorite smash modes of all time: it wouldn't be ultimate without them. And honestly? I'd love to see it expanded on, too.
Master orders: Like before, except if you win enough consecutively then master hand will challenge you, his difficulty scaling with how hard the challenges you beat were.
Crazy orders: Like before.
Tabuu Orders: You will be given extremely difficult challenges to choose from by Tabuu. For example, you might be asked to fight Dracula while also fighting 2 Charizards, or you'll be asked to face 3 metal opponents who are all on the same team. If you successfully beat 8 in a row, then you fight Tabuu.