Patch 2.16 is set to include:

Summoning Bell in Revenant’s Toll
New Features for the Market Boards (Wish List feature, and adjustments on the filters)
Ability to summon minions and mounts at random
Dhorme Chimera and Hydra being added to the Duty Finder
Gear sets will automatically substitute main arm when item is not available
Cooldown timer for timeworn maps to be displayed or adjusted (not clarified)
Crafting stats will affect quick synthesis success rate
Gear dying preview feature
Notification feature for Party Finder
Mog Letter history
New achievement rewards
New feature to reselect focus targets (i.e. Primals after they disappear for certain attacks)
Map marker feature
More action icons for macros
New command to have character look towards the Camera
Characters will appear wet during rainy weather
Potential targets will have a glowing outline when hovering the mouse over them

Currently, the content set for Patch 2.2 (March) is as follows:

Leviathan Primal Battle (Hard and Extreme Modes)
The Amdapor Township Dungeon
The Binding Coil of Bahamut Extension
Thornmarch Extreme Mode
Brayflox’s Longstop Hard Mode
Halatali Hard Mode
New Daily Beast Tribe Quests (Kobold and Sahagin)
New Hildibrand storyline
New Allagan Tomestone types
Glamours Vanity System named Mirage Prism
New advanced crafting recipes
New fishing challenges
New Aesthetician hairstyles