While not many not know her by name, Sarah Blandy is the voice actress who voiced Kagero, Midori, and Layla in the English version of Fire Emblem Fates and while that was her first Nintendo game, it seems there is another one in the works.
According to a listing on her website, above where she is credited for Fire Emblem Fates, it credits her for working on a game with both Nintendo and Cup of Tea Productions, who previously worked together for the English version of Fire Emblem Awakening. No name, nor platform is given for this upcoming title but given the parties involved, it does come across that the title could be another instalment for the Fire Emblem series, and while Fire Emblem for the Nintendo Switch would be something worth seeing, it’s just as likely that the game she is lending her voice to, is Fire Emblem for smartphone devices.
Whatever does come of it though, since Nintendo wish to have the mobile game out before the end of March, we should know the answer soon enough.
Source: Sarah Blandy (Personal website)