Don't get your hopes up too much. The only DLC we will be getting (if any left) are costumes/accessories and that maybe it. Plus, revolution doesn't have a story mode like the other storm do so don't expect boss battles, etc...
I don't know if we will get additional characters though (probably not).
I'm just tired of outfit packs, they're nice and all but not something super amazing.
I hate how they've been handling this series so much, like seriously you have empty spaces in the character list and you have unused combos and character models and hell even some unused team jutsus in the files why not just use them?
Then there's the "Suggestion box" on their site which was a joke from the get go, you know they won't take any of the suggestions seriously.
And yeah I know there's no story like in the other ones but they could at least attempt to do something like the Two Uchiha story.
Maybe all the Akatsuki battles with the jinchuuriki? I dunno man, I guess I'm just disappointed again.