Quick C&P of the patch notes for those who are too lazy to look them up.
Final Fantasy XIV 2.2 – Through the Maelstrom Patch notes:
Confirmed for 2.2
- New Coil turns which drops new Allagan gear [source]
- Leviathan (hard mode and extreme) [source] [2]
- 1 new dungeon (ruins of amdapor) [source]
- 2 new hard mode dungeons: Brayflox + Halatali [source]
- New Hildebrand story [source]
- New story missions, probably leading up to Leviathan. (source needed)
- Extreme mode King Moogle [source]
- Kobold and Sahagin dailies [source]
- New currency like Philo and Myth (source needed)
- New artifact armor (source needed)
- Vanity system (Mirage Prism) [source]
- Expansion of the dye system (source needed)
- Crafters will be able to alter gear designs using a “template” system (official name TBD) [source]
- Wait command in macros will be allowed in-line. [source] [now in patch 2.16]
- Free Company alliances [source] [2]
- New hair styles (Yoshi-P has said each major patch will have a main focus on a single race) (source needed)
- Ability to indicate number of items to store in a retainer [source]
- A retainer can be hired for a Free Company’s estate “From patch 2.2 onward” [source]
- Ability to hide (again) quests from the HUD duty list [source]
- Change luminary Workbench and table visuals [source]
Confirmed to be coming, unconfirmed for 2.2
- Echo buff added to older content (Including Coil) [source]
- Frontlines PVP system [source] (unconfirmed for 2.2, but mentioned to be around 2.2 or 2.3)
- Personal housing (Most likely not in 2.2) (source needed)
- A third retainer (source needed)
- Ability to queue for Crystal Tower with 24 people (source needed)
- Addon support (Originally mentioned to be 6 months after launch. Currently unconfirmed for 2.2 though) (source needed)
- 64-bit clients (Confirmed to be built due to development for the PS4 being 64-bit as well. Currently unconfirmed for 2.2) [source]
- DX11 to be added well after 2.2, even after the next expansion [source]
- 4k Resolution support [source @5:16]
- Ability to queue in duty roulette with multiple people [source]
- Chimera and Hydra added to duty finder [source – patch 2.16]
- Teleport map [source]