Soraya Saga: Xenoblade Chronicles 2 is coming out in 2017: UPDATE Shulk's VA may have hinted lthat they are in the middle of localization

[Nuvendil]

Bristow9091 said:
Question: If this is Xenoblade Chronicles 2... what is Xenoblade Chronicles X to the story? A spin off or something?

All in game indications are that it is either a pure spinoff/alternate continuity or set in the extremely far future and therefore only tangentially connected.