Monsters & Magic) by Sarah Newton.
Another major difference with The Celestial Empire is that the new book, whose working title is Oriental Monsters & Magic, will focus on a particular time period, namely the 16th century. Also, instead of having China as its central focus and depict the neighbouring countries from a Sinocentric point of view, Oriental Monsters & Magic will try and focus in equal mode on the four civilised countries that surround the East China Sea: Míng China, Joseon Korea, Muromachi/Azuchi-Momoyama Japan, and the Ryūkyū kingdom.
I have started a playtesting campaign for the new rules set in Míng China. You can find the campaign log here (beware, it's in French!).