A list of things we didn't know about or are worth pointing out. Lots more things too, just pointing out a few highlights:
You
do need to finish the Odin quests at Quarrymill to unlock Odin. Hop to it.
Aetherial Wheel is basically a thing you put in your FC house that allows you to get company actions without spending credits.
Retainers can now be put outside houses to sell things, bazaar style. House size limits how many retainers can be outside at a time.
Changing classes in any sanctuary (not just towns) no longer incurs a cooldown penalty. I.E. you can change jobs at camps now.
The 3 new dungeons are now Expert roulette. Previous 3 are now part of the ever increasing massive hard mode roulette list. Yes you'll need to do all of these to re-unlock expert roulette.
Soulglazed weapon rate increased. Speed increase for "Light farming" for Nexus.
Item level sync (i110) has been re-instated for older dungeons. Does not apply to 2.4 dungeons (Snowcloak et al.) Sorry, Zodiac dungeon speed runners.
The Echo added to Shiva (lol). Both hard and extreme.
Borderland Ruins (Slaughter) is a new PvP mode that works like team deathmatch instead of node capture. Get points for killing people and other enemies and first to top wins.
Borderland Ruins (Slaughter) replaces the limit break bar with an "Adrenaline" bar. This is a *personal* limit break bar that allows you to perform new limit breaks that only consume your own bar.
Desynth no longer randomly lowers skills unless you are at the combined point maximum!
Desynth cap has been increased! 110 per tradecraft and 350 total.
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The "Most Gentlemanly" pose has been added.

Welp.
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Signs will now be displayed on the enmity list.

FUCK. YES.
Also, /random returns as a command! Hurrah!