I'm going to make a wild prediction and say Zelda U won't release until 2017 for the next home console version. The Wii U version will still be released but a few months after just like Twilight Princess for GC and Wii.
But my prediction doesn't end there! Instead of getting Zelda U for 2015 or 2016, we will get a remastered Twilight Princess that was similar to the E3 2012 tech demo at Fall 2016.