Read the Iwata ask about Xenoblade X:
"Iwata: All right, thank you all very much. Now, there's one more thing I'd like to tell you about.
Takahashi: Sure.
Iwata: This is something I heard from Reggie-san at Nintendo of America. Just a while ago (Eiji) Aonuma-san made a video announcement where he said The Legend of Zelda game currently in development for Wii U will not be coming out in 2015.
Yokota: Sure.
Iwata: So, a poll was held by a game publication's website where they asked what games the readers were excited for now that The Legend of Zelda for Wii U isn't coming out in 2015. I'm talking about a website in America.
Takahashi: Right.
Iwata: Xenoblade Chronicles X was number 1!
Everyone: Oh wow!
Iwata: I think it's amazing that people mentioned Xenoblade Chronicles X.
Kojima: I feel so grateful.
Iwata: Since the game is first coming out in Japan, it will be released in America well after everything about the game has been revealed to the public. That raises the hurdle, but on the flipside, if everyone who plays the game in Japan talks about how much they enjoyed the game world, and how their experiences were different from one another, that would be something great for the western audience to hear. If people outside of Japan hear a lot of positive news about the game, I feel like we can throw an answer to the question of what the future holds for JRPGs. It would be this game, this is the answer to that question, in the form of a video game.
Takahashi: That's right.
Iwata: As of this interview, the game is yet to be released in Japan and we're still trickling out promotional videos, but we already have people overseas talking positively about the title. This is because, as Takahashi-san described earlier, you all put in so much energy that the game virtually became a crystallization of everyone's blood and tears, and people overseas noticed. I think they'll all be excited for the day when they will be able to roam the vast field to their hearts' content and fly a Skell high in the sky to see the world from above."
Obviously game will be released in US in November to replace Zelda U.
I'm not sure about Europe. 2016 probably.