Japan servers have updated to Armonia Episode 4. There are some changes to its UI skin, particularly the new mission info window (Ctrl + M). It seems like some buttons are not used though, since they are still in Korean even for Japanese game clients. I'd update the skin packs on this blog soon.
This includes Jin, Jane, Student President Ludin, and Berthe & Charles.
Armonia Episode 4 Patch Notes
Armonia Episode 4 Teaser Site
Armonia Episode 4 Wiki