What is Apex Legends' Season 9 Collection Event?

Although Apex Legends players are accustomed to seeing a new Collection Event around the midpoint of each season of the game, Apex Legends Season 9 has bucked the trend somewhat and left players in suspense about what the event will look like when it eventually arrives.
jpnlegacy Loot tick pic.twitter.com/hvgvkkzduu
— Garret (@GarretLeaks) May 12, 2021
What is Apex Legends' Season 9 Collection Event?
Season 9 kicked off May 4. Typically, that would indicate a Collection Event scheduled for the second week of June, but Respawn Entertainment has decided to take a different tack this time. The studio's director of communications, Ryan Rigney, previously stated the game would have a "dry spell, content release-wise," in June.
However, Rigney also said Apex Legends Update 9.1 would arrive at the end of the month. It's likely the Collection Event, whatever it ends up being, will launch in that update. We can assume the update will land Tuesday, June 29, in keeping with Apex's typical Tuesday releases.
Data miner Garret has found files that referred to the event as Japan Legacy — though that's unlikely to be the final name for the event — and cosmetics have been found bearing somewhat Japanese-looking designs. A Japanese-themed event would make sense, as new Legend Valkyrie is half-Japanese on her mother's side.
Respawn has yet to reveal details of the Collection Event.