I'm glad they seem to be keeping adult fans in mind. I may be misremembering, but I feel like there was a time (maybe around the FFXIII-era or a bit before with the whole Vaan vs Basch thing in FFXII) when S-E higher-ups were hyper focused on the teen demographic. Nowadays, between this and FFVIIR (and I would assume FFXIV, though I haven't played it) it seems like there's more of an effort to appeal to both old and new fans.
As for the gameplay, I really hope they can balance the combat experience well for multiple (and all) difficulty levels. As much as I enjoyed it, Nier Automata is an example of a game that did not do this well - Normal was a bit too easy and didn't make you engage with all the gameplay systems while in Hard everything either one or two-shot you and in Very Hard everything was a one-shot (Easy was essentially "playing for the story" mode, and it did what it was meant to do, which was fine; I used it for some of the mandatory late-game hacking when I couldn't be bothered) - and the imbalance marred what was a really fun battle system a bit. I know having difficulty modes isn't really what causes that sort of imbalance, though, and it's good that people who just want to play for the story won't be left out.