Sad to say Star Fox Zero's release will be delayed until spring 2016 for quality improvement.
[お知らせ]2015年に発売を予定しておりましたWii Uソフト『スターフォックス ゼロ』ですが、さらなる品質向上のため、発売時期を2016年春に延期することにいたしました。発売をお待ちいただいているお客様には申し訳ございませんが、何卒ご理解くださいますようお願い申し上げます。— 任天堂株式会社 (@Nintendo) September 18, 2015
"[Announcement] is the Wii U software that had been scheduled to be released in 2015 "Star Fox zero," but, for further quality improvement, we have decided to postpone the release date in 2016 spring. Sorry to customers are our wait for the release, but thank you for your understanding."~Translation of post
This is rather disappointing but you know that with this delay Nintendo will work hard at making the game great. It being released now in 2016 says the Wii U won't be dropped so soon, we can be sure Nintendo will keep the console going as long as possible and the quality of this game will be even better than it looked from E3 2015.
Game on and Keep it Rehl!