UPDATE: Nintendo Press website no longer lists the game as March 2017.
source: http://m.neogaf.com/showpost.php?p=202285225
It was originally listed as March 2017: http://gamrconnect.vgchartz.com/post.php?id=7873591
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Original Story:
According to the financial reports, Zelda for Wii U is now listed as 2017. Here is the pdf. You can use ctrl + F to find it.
https://www.nintendo.co.jp/ir/pdf/2016/160427_4e.pdf
It is on page 6.
Edit: Took a screen cap for you guys:
Here's a quick video to digest this news.
Link: https://www.youtube.com/watch?v=IMBBVAAeALY&feature=youtu.be