In an interview with Famitsu (translated via IGN), Dragon Quest X producer Yosuke Saito and director Chikara Saito confirmed that the game was coming to Nintendo's NX system. Note, this is Dragon Quest X, the online multiplayer release in the series, not the upcoming Dragon Quest XI. The interview was about the general state of the MMO.
"I think there will be an influx of new players that peaks with the launch of the PS4 and NX editions", said Saito. "Up until then, rather than the incoming new players, we are doing our best for the people who are playing already."
The company previously confirmed the PlayStation 4 version of the game. Dragon Quest X launched on Wii in 2012, with Wii U, PC, and Android versions following in 2013. A 3DS version was released in 2014, but since then the Wii, Wii U, and PC have been Dragon Quest X's steadfast platforms. It's currently on version 3.3 in Japan and it's likely that the PlayStation 4 and NX releases will be the upcoming version 4.
Last year, Square Enix stated that Dragon Quest X and Dragon Quest XI were both coming to Nintendo NX. The company later changed its tune, saying NX versions were just under consideration.
"It is under consideration, but we don't have further information to share at the moment," Square Enix said in a statement at the time.
Dragon Quest XI is confirmed for PlayStation 4 and 3DS, with a planned release in Japan before May 27, 2017, the end of the series' 30th anniversary year. There is currently no Western release planned.