The game will be released for PS4, the Nintendo 3DS, and apparently the Nintendo NX that is still in development.

http://www.siliconera.com/2015/07/28/dragon-quest-xi-announced-for-playstation-4-and-nintendo-3ds/

The game looks like an HD version of DQVIII on PS4 but the 3DS has an interesting setup as the top screen displays a DQVIII style setup while the bottom screen displays an SNES/DS Remake sprite format.