If they added a Persona 4 Yukiko costume it'd be the apex of fan service
We now know Lightning Returns will feature four distinct areas, the newest revealed of which is a "vast, open-world area in vain of Bethesda’s The Elder Scrolls V: Skyrim" in which you can ride Chocobos and generally gallivant around. I'm also quite interested in the first city where Lightning apparently is investigating a murder. Games tend to do investigation poorly, because failing would mean ruining progress and pacing, so it will be interesting to see if that bit is any fun.
There will also be over 100 shop types. Talk about meeting your critics. It's like when Square was super excited to awkwardly show off the jump button in Final Fantasy XIII-2. "You wanted shops?" Square asks. "How about over a hundred different kinds," game director Motomu Toriyama screams from the rooftops while batting at fan requests flown in on paper airplanes.
Speaking to the legitimately interesting "dress up" portion of the game, certain outfits allow you to alter the colors, while save data from previous games will grant access to Lightning's earlier outfits. On top of that, you can dress Lightning up in Yuna's summoner outfit from Final Fantasy X, which gives her a demure bow post-battle.
I actually thought it was going to be Auron's garb given that her default clothes look similar. A bit less excited with this. Then again, I'm presently mildly less excited about the project as a whole after reading that sophomoric interview about increasing Lightning's bust and adding jiggle physics. Just let me be tentatively excited, Square! Since it seems everyone is fair game, any other outfits you'd like to see? I vote something from Final Fantasy XII.
Lightning Returns: Final Fantasy XIII pics and info from Tokyo event [All Games Beta]