With the release of the third path, titled Invisible Kingdom in Japan recently as DLC for Fire Emblem If, Nintendo uploaded a trailer dedicated to it. The scenario is priced at 2,000 yen and can be bought through the main menu, then the choice, alongside Hoshido and/or Nohr, will appear in Chapter 6. You can watch the trailer below.
Fire Emblem If or Fates, will be released in North America early next year.