One of the things I'm most excited about in ARR is the promise of throwbacks to previous FFs. In this thread I would like to discuss some of the many things and places SE could incorporate, plausible or not. Just daydream a bit and toss anything out there (having to do with previous FFs, not "I want swimming", I do too). I'll start.
Midgar - I would love to see a town that is a bit technologically advanced with a subway system, shops, a neighborhood, and the slums. It doesn't have to be exactly like it, but enough to bring some nostalgia.
The Golden Saucer - Yoshida already stated that something like this is in the works. I hope it's complete with all the little mini arcade games and perhaps even some new ones with a tracking system for player high scores and prizes (probably vanity items of some sort).
Rabao - A finishing town in the middle of the desert from FFXI if you didn't play. It was a really cool place to be during the padded caps epidemic. There were always folks out there fishing and it was a nice place outside of the towns to hang out and meet people.
Tetra Master - A card game from FF9, available as a side service along with FFXI. In ARR, I'd like to see it incorporated into the actual game.
Chocobo Circuit - They had this in FF7 and FFXI. With the current technology they have, they could do so much more with this. A sort of Mario Kart like game within a game with leader boards and prizes.
Just some things off the top of my head. What would you like to see?