Three is correct in his appraisal of The Realm's creation. The short answer to your question is: "No, what you get in ToHA is all the information currently available about The Realm".
The longer answer runs thusly. The modules in ToHA reference Valespire, but any major city in nearly campaign world will do just fine. The principal world stipulations within ToHA, devoid of campaign flavor, are these:
There's a Kingdom, and the players are in it.
This Kingdom has a King.
This Kingdom has a major church with significant political influence.
As those three tropes exist in like 99% of RPG campaign worlds, it felt pretty safe to use them.
It should also be noted that none of the modules in ToHA actually take place IN Valespire. The place is referenced, but does not appear. Sins of the Fathers
, this year's GenCon premiere, IS set in Valespire, and makes use of the existing world notes in ToHA, but even then the only major campaign stipulation present in SotF is:
The Mages of the Kingdom have been driven underground.
This is the single biggest factor that makes the "Realm" flavor different from any of the thousand other fantasy rpg settings out there). In the ToHA flavor, this has happened at the hands of the church, but your campaign world can work it in however you want.