Garo x Final Fantasy XIV announced to involve PvP starts on Jan 17
They announced during the Live Letter that the next crossover event with be with the Japanese Anime/Tokusatsu franchise Garo. The event will be starting on January 17th.
Weapons, Armors and Mounts will be available from the Goldsaucer (non-dyable) and PvP (dyable).
Paladin will be getting the Golden Knight Garo armor and Ninja (which Rei Fujita mains) will be getting the Silver Knight Zero (character Rei Fujita plays) armor.
Update:
Paladin: Golden Knight Garo
Warrior: Barago/Dark Knight Kiba
Dark Knight: Dark Knight Kiba/Barago
Dragoon: White Knight Dan armor
Ninja: Silver Fanged Zero
Other classes: Various Makai Priests/Alchemists
Mounts:
Garo's Golden Mado horse Goten
Zero's Silver Mado horse Ginga
Kiba's Black Mado horse Raigo