Fairly common for Nintendo.
They only released that graphic last year to get people to buy it over the holidays, with assurances that many games were coming in the future, so it's worth the investment. Nintendo has a long history of spacing out and delaying their major titles. I don't think this year is necessarily any worse than most previous years.
Also, Xenoblade is not getting delayed. The game's already done, it comes out in Japan in three weeks. Localization for the west has been ongoing for the better part of two years. I would be shocked if it came out any later than October.