Nintendo has confirmed the new release date for Wii U exclusive Star Fox Zero as April 22nd 2016, at least in North America with an EU release expected in the same month. A new look at the game was also revealed with one of the newest additions being Landmaster turning into the Gravmaster, essentially a flying tank to take on various enemies.
Star Fox Zero was originally expected to release for Christmas 2015, but was delayed as Nintendo needed more development time.
Source: Nintendo Direct