I'm running with the idea that Nintendo in a panic decided to blow their load of game announcements early. It seems like a relatively ambitious project and I don't think that footage looked near completion. I think several of the titles will end up being 2014 titles. Yoshi Yarn also had video iirc.
X has been in full development since the middle of 2010, and we can assume planning began at least 6 months before that. If it doesn't release this year, then it'll have been in development for over 4 years, with a full team for over three and a half years of that. Even by Nintendo's standard, that's a long time in development, and what's more we've actually seen in-game video of what very much looks like a game less than a year away from release.
I'd expect the game to release in September in Japan, and I can't see any scenario where it'd slip to next year.
If we're lucky, Nintendo will have adopted a sensible localisation strategy owing to the critical success of Xenoblade, and westerners will get the game in October/November. Otherwise, next summer would be a good bet for an international release.