Returning player just wondering what new?

[Enkidoh]

Luckily you're not that far from the end, but you still have to do the Chrysalis boss fight, on top a fair bit of story exposition quests to do before you get to the Steps of Faith (the final boss fight), and the resulting quests and ending cutscenes. Steps of Faith originally was very difficult (due to requiring flawless co-operation and communication between players in the party) but it was recently nerfed (I tried it pre-nerf and I just couldn't get past it for various reasons, but post-nerf it is much easier and far more enjoyable) so you should not have any trouble with it.

There are no more dungeons you have to do for the main story, just two boss trials (Chrysalis and the Steps of Faith). Things that are new that are unrelated to the main story is the addition of FFVII's Gold Saucer amusement part (accessed via a quest in Ul'dah), several new optional dungeons, and more. But really the 2.55 patch was mainly to with the completion of the 2.X storyline in preparation for Heavensward.

So just keep at it, you don't have that far to go.