If you haven't seen this chart you might find it helpful!
As for a tier for just the two setting books... I think there is a decent chance of that being added from the sounds of it.
The premium slip case contains eight books. The first six are the six Cursed Scroll zines in hardcover. These are ~70 pages. One is the GM'S Guide to the Western Reaches, and the other is the Player's Guide to the Western Reaches. These will both be ~200 pages. The Player's guide has all of the...