Possible? As soon as someone gets a Japanese ROM then makes a translation patch for it... but considering how long fan translations take for some other games, it's probable that the official localization will come out first. And depending on the skill of the fan translator, it could be a "blind idiot" translation, rather than the rather well-handled localizations that we've been getting.

Considering that we'll only be four months behind Japan, I don't know if anyone will feel that it's a good idea to make an early translation patch.