I took some notes.

Patch 5.18 arrives on 12/24.
This is the usual end-of-tier nerf patch which removes the weekly restriction on Savage loot and allows you to buy the weapon upgrades outside of Savage by using a Yohra coin.

Patch 5.2 title is Echoes of a Fallen Star. Coming mid-February.
  • Sidequest: The Sorrow of Werlyt
  • Trial: The Ruby Weapon
  • Trial 2: ???
  • Dungeon: Anamnesis Anyder
  • Beast Tribe: Qitari (Qiqirn, DoL)
  • Raid: Eden's Verse (includes Ramuh remix)
  • Bozja Weapons: The new 'relics'
  • Skysteel Tools: DoH/DoL get upgradeable quest tools too
  • Diadem: DoL content, no battles, don't need fuel tanks
  • Fishing: Ride a ship out to join new Ocean Fishing challenge
  • MSQ and Ishgardian Restoration continue

System Changes
  • Equipment is no longer destroyed when converting spiritbond into materia.
  • Can meld materia without specific class reqs, only need to lv one DoH class to meld on all types of gear.
  • YOU WILL NO LONGER NEED A DOH PARTY FOR FC PROJECTS, can finally complete building projects solo.