It will be released in Holiday 2017 at the earliest, various things do point to this.
- Scott Moffitt has already told us this is not the transition year when it comes to development, even though that is indeed mere PR talk, his words still have credibility, and there is nothing pointing at this being a transition year, not E3, since Nintendo clearly specified they would talk about 2015 only and some early 2016 titles, nor the Zelda delay, since Zelda always get delayed, aside that what we saw in the VGAs was clearly in need of huge work done to it.
- A interview with Miyamoto from December 20, 2014, says that they were still thinking of console ideas, in other words, unless they thought of the idea, setted the specs, got the hardware ready, got all the contracts, already have launch titles done, and more, it is impossible the console will see a 2016 launch.
- A interview from Iwata makes the NX seem as if it was still in its conceptual phase, this interview is from one month ago, and he said that they couldn't give a time period for when would the NX release since they didn't even knew how the NX would look like since as of May 2015, the NX is still in a conceptual phase.
- A interview with Tanabe said that if they would begin working on a Metroid Prime 4 now, it would take atleast 3 years for it to be done, and that would LIKELY be in the NX, now that means they are still not working on one, and that NX could not come out till atleast 2018, but the most important thing is that htey are not working on one, meaning that internally, no dev kits have been given for the NX home console, if not a tease is what would had been given, instead of a mere "likely on NX"
-The QoL is suppose to release next year, no? Even if it is not related to gaming, Nintendo will most surely not be able to handle so much stuff at the time, we have seen how unable they are to handle the amiibo situation, with that alone it is clear that it would be impossible for them to do 2 hardware launches in the same year, while handling hte amiibo situation at the same time.
So all points tell us that anything earlier than 2017 is impossible, and as home consoles always release in the Holidays, that would mean a Holiday 2017 release for NX. Also they have never said they are revealing NX next year, they have only said they will talk more about NX next year, if that means they will reveal it next year, it is not clear, but clearly stating that reveal will be next year has not been said, so we cannot say that NX will be reveal next year, since they have only said they will talk about it, so for all we know, NX will be revealed in 2017, and released in 2018.