Via insertcredit.com :
Apparently, DQ IX coming out on the DS is a big deal over in the land of the rising sun. And the fact that the combat system will be action-style instead of turn-based. Did they really expect the game to keep doing the same thing again and again forever? Anyway, the DS is a better platform for it… Square-Enix already has one flagship RPG series on the consoles (Final Fantasy), and none yet on handhelds, so why not just move their second-oldest title there?