It was initially announced when Dragon Quest XI was revealed that the game would be coming to the NX. Square Enix then backtracked but it has now been confirmed that the game is coming to the NX. The developers are targeting a simultaneous release across platforms.
The following is from the October issue of Nintendo Dream.
Masahiro Sakurai: Well then, I would like to ask about each of your new games. First, Dragon Quest XI. The 11th installment in the series will be released simultaneously on Nintendo 3DS and PlayStation 4, and including NX it’s coming out on three platforms, right?
Yuji Horii: That’s right. The use of hardware is different for each system, so it’s quite a challenge.
Sakurai: Thank you for working so hard.
Sakurai: I see. Including things like the release date, it gets dreadful when development is inevitably drawn out and the debugging piles up… But shifting away from the release date, they’re not going to be released apart from each other, right? Since Dragon Quest games are story-driven.
Horii: That’s right. Spoilers will emerge if we release one version earlier. (Laughs.)
And there we have it. The game will be coming to the NX. Now we just need to see the NX be revealed.