Disclaimer: This is a rumor, and should be taken with a grain of salt. However, the source is one of the largest French gaming publications, so it would be naive to dismiss the publication without at least a bit of legitimacy.
According to the French publication Gameblog.fr, the Nintendo NX was originally meant for a launch at the end of this year. However, due to some game delays and other factors, the console was delayed to 2017. The reported specs are about equal to PS4 Neo, but are not “cutting-edge technology.” The platform will feature new games like Zelda and more, but several remasters as well, such as Skyward Sword, Mario Kart, and Smash Bros. The console also has several third-party exclusives in development, reportedly from Square Enix and Capcom.
The article also mentions that a full NX reveal will come in September, likely around the time of TGS.
For more information on this rumor, check out the full article and turn on your translator!