There's a lot of stuff in Wisdom of the Drylanders but it's very important to note what's not in it. No mention of New Kurn, and certainly the term "Old Kurn" is never mentioned (since that implies that there's a New Kurn). Even the spymasters aren't aware of it -- their attentions are directed towads the Dry Lands and the Dim Lands. Yes, they have some idea that Oronis is doing something north of Kurn, but since the spies go out into hostile lands, they need to be kept in the dark since if captured, they cannot reveal what they do not know. Finding out about New Kurn would by necessity mean the end of the spy's career.
Only about 1/4 of Kurn -- the Merchant quarter at the Southern Gate -- is open to foreigners. Only citizens and slaves are permitted beyond the Merchant Quarter unless accompanied by the Grey Heralds-- the bureau of templars that deals with foreigners, monsters, and ecology. (issues of water and air contamination, for example, are regulated by the Green Brethren).
In the day to day, Kurnan citizens interact more with their own local elected "Clave" leaders. Claves are housing areas or neighborhoods controlled by a single guild which acts more or less like an extended family.
Guilds vote in block for the Kurn's tribunes, who in turn elect a presider.
Oronis and the templars run Kurn's defenses, espionage, and the education system; they also regulate all interactions with foreigners
What do you want to know about? Oronis' great library and the associated school of spies?
The templar orders of Kurn and their function?
Kurn's independent government?