1. Viera/Hrothgar hat mod made official content.
2. Better chocobo barding, ie. barding that isn't just a meme like a santa outfit but practical and more realistic, preferably ones that don't cover the wings.
3. New movement system more reminiscent of 1.0 that feels more weighty and natural.
4. Individual left/right customization for gear. Some earrings/bracelets appear on both ears/arms, why not let us hide one or the other or even add two for pieces that are currently only on either? I'd say allowing us to do the same with gloves/boots would be great too, although that might be a fair bit more work.
5. Chat bubbles. Insane that this isn't in the game already.