I played XI from 2003 until 2007, and I had tons of good times. I'm really happy they are keeping the old races and new races highly similar; it's great too that stats for races apparently won't matter as much either, therefore giving us the ability to customize ourselves in sync between stats and appearance.
I'm likely to try out XIV although I'm not 100%...Maybe 90% or so.
I'd really enjoy playing with familar faces and friends while being open to meeting new people since that's part of what the MMO experience is all about. Hopefully there is a Quetzalcoatl server, but if not then maybe we can settle this in some kind of vote here on qcdn. Winning vote gets the qcdn stamp of approval. Just throwing my ideas out there until the server names are released.
And although they've said it, I hope they mean it when they say XIV will be more friendly to casual players. Unlike my time with XI, I now have a home, wife, and baby. I'm not even arguing casuals can do everything, just that the market for us to enjoy ourselves is there. Even if it's not, I'd probably settle for being a low end character just to experience the game-world if the community is of great quality there like it was for XI.