I'd like to see more cameos from past characters so you really feel like you're in the Final Fantasy world.

And I don't mean like the Garlean Empire opens up a dimensional portal and brings in Sephiroth for you to fight, I mean minor characters with subtle cameos.

Characters like:
General Leo
General Beatrix
Invincible Shield
Orlandu
Ultros
Gilgamesh
Gogo
Vicks & Wedge
Reno & Rude
Thorn & Zorn
Marlene
Boco the Chocobo
Barkeep
Old Dalan
Rin
O'aka XXIII
Maechen
Reks
Reddas


You get the idea, there's plenty more that can be named.
And even if they have nothing to do with the original, some familiar names would be nice instead of a bunch of no-name, nobodies, with no voice overs would make quests worth reading.