In Ultimate Intrigue the Dandy archetype for the Ranger becomes a spontaneous cha caster using progression from the Medium and uses the bard spell list up to 4th level spells.
The main question is: as it casts off the Bard list is he an Arcane spellcaster, or does he remain a Divine one because there isn't an explicit change?
As a precedent most classes that add spells from other lists explicitly say that they become divine/arcane/psychic, but it might still be unclear.
And on a secondary note: by using the Medium's progression, does he indeed get the 0-level spells using the Bard's cantrips?
Still a divine caster. (This also seems like RAI- it's a 4/9 caster, and would address arcane spell failure chance if that was the intent.)
And yes, enjoy your Bard cantrips and full caster level!