Based on Eurogamers rumor it sounds like Mother 3 is coming to America after a 10 year delay. Rumors are coming hot and heavy that Nintendo finally plans to release their iconic RPG in Europe and North America.
The Mother series has a long and tangled history in North America, but has seen some of a resurgence in recent years. In 2013, Nintendo released Mother 2 aka Earthbound on the Wii U’s Virtual Console, and in the summer of 2015 they surprised everyone with the western debut of Mother 1, aka Earthbound Beginnings. Nintendo had already translated both of those games into English, however; the only English version of Mother 3 is a stellar fan-translation patch spearheaded by Clyde “Mato” Mandelin and released in 2008.
If Mother 3 were to come out in the west, Nintendo would either have to start from scratch or use Mandelin’s script, which he has offered to them for free.