In that regard the most relevant "console" in Japan is PS3.
True, but I was meaning more in current gen hardware. I assume they wouldn't develop the game on last gen hardware, though I guess it's not impossible.
If the game came out on PS3, then I'd say we have a chance of seeing it in the rest of the world. If it comes out on WiiU, then IMO localization is a lot less likely. WiiU is doing a little better now but in general still pretty bad. SE isn't going to bother localizing a game for a struggling console, especially seeing how sales of DQ outside Japan have never been that great.
Nintendo could conceivably pick up the localization and publishing in other regions if it were on the Wii U like they did DQIX and the remakes. I think actually it would probably be more likely than Square localizing it, or even Sony doing if it were to come out on the PS3/4.
But I don't think it's a real possibility. I only mentioned it since that console would make more sense than the PS4, since it's selling twice as much. I don't think there's a real chance it'll come out to a console, at least not as a lead platform. I'm fairly sure, based on the handling of the series in the last few years, it's destined for the 3DS or New 3DS.