Definately a quest for the Supersoft ala FFIX to get back the twins. I know in the GBA version I saw that if you inspect them the menu opens up as if you're supposed to use an item, i'm not sure if it's already there but it just screams as if something that was supposed to happen was left out.

Flashbacks would be awesome, Cecil and Kain growing up, being raised and taught about life by King Baron. Cecil studying studiously to master the art of the Dark Sword.

Also I would like to see the aspect of the two moons and the changing of colors be elaborated on, as this is very subliminally shown in FFIX, in fact the last image in that game is of the two moons.

More backstory on the Lunarians!!!

Also more on King Bahamut's departure from the Land of Summons, and what it was he's doing on the moon and what exactly the two kids there with him were.

With Dissidia suggesting connectivity, it might be interesting to see some connection between mount, an the castle of, ordeals. And of the rat tail, adamant, and excalibur for that matter.

In fact there's so many things that could be elaborated on if connectivity is real, like Mysidia, the Lunar Whale being a futuristic version of the Invincible, other things I guess. But that's just my hopes.

Definately more, I love conspiracies!!!