Dungeon Fantasy needs a bare-bones setting

[Tyneras]

I would go for worked dungeons and encounters, but I don't think that a specific setting designed for DF would be a good idea. That would just constrain the creativity of both the setting and future DF books. If you have a setting, just make notes for how this or that would work if you play DF using that setting, or retrofit it with a supplement like DF: Banestorm or DF: Madlands.