Square Enix has announced that Dragon Quest IX will ship to retailers this Christmas. They also said that using the customization option you can create around 10,000 unique characters. Wii connectivity is confirmed.
Update: Dragon Quest Swords will ship in 2007 as well.
Update #2: Several Dragon Quest remakes are under discussion.
Update #3: Square Enix has said that although they ship Dragon Quest IX and Dragon Quest Swords in 2007, "Next year will be the real 'year of the Dragon Quest'".