Nintendo has announced an official release date for Shin Megami Tensei X Fire Emblem in Japan. On their latest blog post, they announced that it will be released in Japan on Wii U on December 26.
Nintendo also revealed that first-print copies of the game will include DLC for costumes from other Altus developed games. This includes Walter from Shin Megami Tensei IV, Princess from Etrain Odyssey III: The Drowned City, Rei of Persona Q: Shadow of the Labyrinth, and the protagonist of Devil Summoner 2.
More details are expected to be released next month. Fans in North America will have to wait until some time in 2016 to play the game.