The Alderac Entertainment Group has announced the April release of The Legend of the 5 Rings RPG: Emerald Empire 4th Edition. Emerald Empire is an essential sourcebook covering all aspects of the Emerald Empire of Rokugan including politics, celestial order, family life, martial arts, customs, and family life as well as a full glossary of Rokugani terms, and an update to the classic way of the Daimyo. 
Long one of the most desirable of the L5R publications, the new 4th Edition Emerald Empire volume brings all mechanics up to 4th Edition levels, while adding upwards of 30% new content with new chapters on Rokugani art and religion.