teaser site confirming it's coming to iOS and Android in Japan in the winter.
There's no word on prices yet, or which versions of each game will be ported over; DQ 5 and DQ 6 recently came to DS, for example. The announcement is only for Japan, but bear in mind Square Enix released smartphone ports for Final Fantasy 1-5 worldwide.
Meanwhile, a new Dragon Quest Monsters game, subtitled Super Light, is also on the way to iOS and Android. There are no details on the spinoff entry as yet, but you can go enjoy a cavalcade of bleepy bloopy sound effects on its teaser site.