From the SE dev post its sounds like we'll get:
1)battle adjustments and then raids (prob in that order doubtful same patch)
2)More storyline quests geared towards party play
3)Ishgard, which will probably add more storyline quests since our nation's will make us go to Ishgard, like FFXI rank 2 or 3 made you go to Jeuno, and then you heard the rumor about the "airship pass", stuff like that, seeing this being september 2011 or later.