8-4 announced they will not be handling the localization for Fire Emblem: Three Houses on its Twitter account.

8-4 had previously translated three Fire Emblem games for Nintendo: Fire Emblem: Shadow Dragon, Fire Emblem Awakening, and the most recent, Fire Emblem Echoes: Shadows of Valentia. They had handled localizations for game publishers such as Bandai Namco, Capcom, Disney Interactive Studios, and Square Enix.

Fire Emblem: Three Houses was announced for Switch during Nintendo Direct at E3 2018.

Sources: Siliconera, 8-4 Twitter.