MithraPride

The Feast of Swords is a Far Eastern festival in which town residents celebrate their sons' healthy growth by dressing them in traditional armor to participate in mock battles, and raising banners in the shape of enormous fish.
Starting at 01:00 PST on April 27, the Feast of Swords is once again coming to Vana'diel. And once again, nothing the Moogles plan ever seems to go smoothly... Adventurers, be ready to brandish your Kupelcian-designed wooden katana, and help save the day!

Further details regarding the festival will be released on the day of the event.

I looked through the patch notes again and found only one new Item that seemed (possibly) related, and that was this

Shinai

Level: 1
Flags: Rare / Exclusive
Slot: Weapon
Type: Tachi
Jobs: All
Races: All
Damage: 2
Delay: 480
Damage Per Second (DPS): 0.25
TP Per Hit: 13%
Equipment Category:
Weapons / Great Katana
Effects for Shinai:

* Fellow: STR+4 DEX+4

It's a proper kendo sword now, none of that wooden stick rubbish