What's unique about FFXIV:ARR?
Nothing, that's why it will be good... SE is NOT trying to reinvent the wheel, they took 100 people told them to play 10 MMO's and took whats good from each one and compiled it... Don't expect SE to reinvent anything, they tried you guys hated it (1.0). Expect to see things you have seen and liked in a wide swath of game's, don't expect "never seen before".
GW2 did that, is was trash... with ARR SE with give you things you like, not new stuff you will hate.