This seems more like a suggestion than a question, but I've had some ideas for new instances.

I think some mechanics could be added to new dungeons, i.e. a chase scenario where you get to ride chocobos or some other mount in a dungeon while trying to escape a boss that will be fightable later in said dungeon. Another idea for mechanics would be getting to access special areas by discarding/placing a certain number of items (armors, weapons, etc.) that you get in said dungeon or other dungeons that allow you access to better items, albeit there being battles before the items could be attained.

As far as any actual questions go, will there ever be actual sea exploration, i.e. sailing? And if so, would there be mounts that would provide access to such areas? Will we get to see other Final Fantasy cameos further into the game's lifespan? I'd really like to see characters from FF8, as I feel like that series has more of a connection aesthetically (see Allagan Empire + Esthar).