Makes sense making the jump to ps4, specially if they intend to release in the west(please god they must).But seeing as wii u have already a fanbase in it, due to DQX,and the expansion having sold well in the golden week, i wouldnt rule out a wii u version.Hopefully we will get more information at E3.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1