There are several iconics still missing; mesmerist, psychic, medium, skald, investigator, ninja and samurai as well as the vigilante and brawler.
Apart from the occult classes and the vigilante, all of those are covered by the miniature sets.
We'll have to wait and see if they'll announce another batch of class decks and how many characters the next base set will cover. They could cover all of thr missing ones with a single base set and character add-on deck, but that is probably unlikely.
The Iconic Heroes sets of minis aren't only used for PACG (they are also used in the RPG). If they were, they would have never printed them.
As to when they'll add the other Iconics to PACG, who knows?
Our goal is to get to all of them sooner or later. We usually don't introduce a new iconic until we have a clever mechanic we want to use for that iconic. Eventually, we'll come up with something for Quinn.
May I humbly fully support Mike on that one. We don't care to have all the iconics just for the collectible fun of it. We want each class to feel like a different experience. I am already amazed how Mike and team manage to diversify until now. I am OK to wait until they find a new amazing twist. We were so pleased when they created the ideas for the Oracle, Ak or Mavaro for example.