Well, guessing Shadowlands does have to be soon, we're getting announcements on a new sourcebook, Courts of Stone .
This book is all about castles and palaces in rokugan, and the politics that occurs inside them. It will focus on the Crane Clan similar to how Shadowlands is with Crab, but will talk about castles and courts all over Rokugan. It will have a player-focused chapter which introduces the new Deer Minor Clan, another new set of schools and techniques as well as equipment, and will appear to be focusing a bit on shinobi with new ninjutsu and notes about including these characters in your campaign. The third chapter for GMs will detail how to set up a Winter Court, and advice for intrigue focused campaigns, including ways to track and invest in bonds between characters.
https://www.fantasyflightgames.com/en/news/2019/3/1/courts-of-stone/
Also, got a new adventure, Winter's Embrace, which is a winter court adventure.
https://community.fantasyflightgames.com/forum/561-legend-of-the-five-rings-the-roleplaying-game/
I'd say we have our release template - three chapter sourcebooks which are about a general topic, but will also focus generally on a Great Clan and Minor Clan but every Clan will have new options in the book.