Various Genshin Impact leaks state that Arlecchino and Dottore will be playable characters in the future, with the former possibly being summonable in a Fontaine patch. However, these types of rumors aren't verifiable, so the general public can only assume that the leakers who spread this information are telling the truth. There are, unfortunately, no specific leaks about when these two Fatui Harbingers will be playable.
Fontaine has been leaked to come out in Genshin Impact 4.0. Much of the playable entities for that patch have already been revealed via some leaks, yet all Travelers have are some old character models and a few names.
Some leakers are confident that Arlecchino will be playable in one of the Fontaine patches. That wouldn't be super surprising since Travelers already have two Fatui Harbingers they can use in Childe and Wanderer. However, there aren't any specific leaks regarding Arlecchino's role in the upcoming Version Updates, her gameplay, or which patch will feature this character's banner.
At the very least, those aspiring to main this entity can be confident that she will be playable one day.
Some leaks also specify that most Fatui Harbingers will be playable. On a related note, Natlan will apparently have a plot tied to resurrection. It is currently unknown if La Signora will be factored into the storyline or whether somebody else, like the Pyro Archon, will be revived.
Fontaine is yet to come out, so Genshin Impact players won't learn more about Natlan for at least several months unless a very early leak comes about.
This old leak would be the closest to current information regarding potentially playable Fatui Harbingers. Pierro, Pulcinella, and La Signora are the only characters not known to be
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