Merry_Blind :
Nintendo have already stated that Zelda: Breath of the Wild will be released on Wii U and NX on the same day, and that it would also launch alongside NX on its launch day. They are targeting March 2017 for the release. They were probably aiming for Holiday 2016, but couldn't quite make it, and they can't afford to wait until Holiday 2017 since the Wii U is pretty much dead already, so might as well release it whenever it's ready. They just need to make a massive marketing impact with it though, which is something Nintendo often struggle with...
We'll see! Can't wait!
I won't mind if Nintendo even waits until Q3 or Q4 of 2017 honestly as long as they actually have a good amount of first-party games upon release. When the Wii U came out, there was one game, New Super Mario Bros U, that was first-party. There was also Nintendo-land, but nothing big, really. Pikmin 3 was supposed to be a launch title but was delayed until March. It took Super Smash Bros a good while to come out. Mario Kart, too, did not come out for quite a while. They didn't get games out fast enough, and they did a poor job of marketing the console, by making its commercials targeting strictly 4-year-olds. The Gamecube, not that it sold well, had better commercials, and everybody remembers the "Wii would like to play" commercials back in 2007. The Wii sold very well, and was marketed for all ages, not just little kids.
Nintendo can't just release another console and have one first-party game. As huge of a game Zelda is, that can't be the only popular game upon release. We can't expect a Smash Bros, history shows that to come out generally one year after the release of the console. Rumor has it we
may be seeing a Super Mario Galaxy 3. There is always one solid Mario game upon release: N64 had Mario 64, GCN had Luigi's Mansion (followed by Mario Sunshine a year later), Wii had... actually, the Wii did not have a first-party title upon release, but it did come with Wii Sports, which is, I think, the best-selling game
ever (since it was bundled). Wii U had New Super Mario Bros U. We won't be seeing any of those anymore since Mario Maker is out.
I don't know what the NX will bring as launch titles, but I just hope it has more than
just Zelda and other random games.