Hmm... I can only say so much, since I still need to finish getting myself up to date on the series. That said, I'd love to see some more obscure Disney movies/stories brought into the mix, if they haven't been already. There've been a few neat series lately as well, though whether they'd ever(or even could, depending on how the rights work) have some of those featured in a KH game is questionable at best. Ah well, I can dream. It'd be neat to see Gravity Falls or Star vs the Forces of Evil featured in a game. Though, I'd also settle for Zootopia, which I don't think has been featured yet either.
I'm probably just digging myself deep into a KH noob hole here, aren't I? Have mercy on my soul. I'm watching a let's play, I swear!