Most recently in development has been an official Job System, with unlock quests and everything. It has moved away from the convoluted Physical Level and Job Rank nonsense into a more traditional Level and Experience system. It's added Chocobos and Air Ships (albeit not unique to FFXI). They've removed the poorly designed Stamina combat system and replaced it with a more traditional cooldown and autoattack system.
Something unique they are working on is a Materia System (related to FF7's Materia only nominally). Use weapons, convert 'experienced' weapons to Materia, socket Materia on to new weapons.
The combat system chances are on-going, and it will take at least 2 more patches until things are "balanced". So maybe the game will be worth playing right when SWTOR arrives on the scene to steal its thunder.