Fire Emblem Fates was released in Japan under two versions, Birthright and Conquest. Both will have different events and a unique storyline. According to a listing found on Amazon Europe, the West may be getting a bundle that includes both versions of the game in one package (similar to the Pokemon Alpha Sapphire/Omega Ruby bundle). Both versions of the game have been confirmed for North America and Europe, and a bundle with both versions at a slight discount could be more desirable for gamers in those areas.
Take this information with a grain of salt until Nintendo makes a statement on this. We may still have to buy the versions of Fates separately when it releases. I hope Nintendo goes through with a bundled option, though, so it will be easier to get the full experience.by