The following details come from Nintendo of America:

In 1992, the second game in the Fire Emblem series, Fire Emblem Gaiden, launched exclusively in Japan. Now, for the first time, fans outside of Japan will get a taste of this classic game on the Nintendo 3DS family of systems. Fire Emblem Echoes: Shadows of Valentia is inspired by the 1992 original, reimagined on a grander scale. Every aspect of the Fire Emblem Gaiden game’s presentation has been updated, along with the game being fully voiced. Fire Emblem Echoes: Shadows of Valentia recreates classic Fire Emblem gameplay with a modern twist, mixing in exploration of dungeons crawling with enemies.