As of right now, the only way to play the Mother 3 in English is through an unofficial translation. Since Nintendo recently announced that they are going to release Earthbound via the Wii U Virtual Console, those very same dedicated fans who worked on the unofficial Mother 3 translation are offering all of their localization files to Nintendo. And they don’t want any money in return, just the satisfaction of seeing an official release of their favorite JRPG.
This is what translator Clyde Mandelin posted on the development blog: “I realize that localizing a game this size can cost a lot, so if it’ll help in even the slightest, I’ll gladly offer to let Nintendo use my text translation files for any use at all, completely for free. I’ll even edit the files to fit whatever new standards are necessary (content, formatting, memory size, etc.), completely for free. I’ll even retranslate everything from scratch if need be. Just whatever it takes to get an official release out.”
Will we be able to play Mother 3 in English? I think we will. But when?
Source: Mother 3 Fan Translation