This is from Jeff himself on social media; I reckon it is of great interest to readers of this blog.
“I am wrapping up the final text of the Gods and Goddesses of Glorantha book, while making sure that it all ties into both the new Heroquesting chapters in the GM Sourcebook and into the Hero Wars Campaign. It is increasingly looking like this will be a two-volume book, as it includes the long form of more than 70 cults.
It is perhaps easier to say what the book does not have:
1. The Invisible God of the West. This needs its own book, as my notes keep expanding. Additionally, the Invisible God needs to provide a materialist and humanist interpretation of the Gods and Goddess book – and serve as the Sorcery Book. So this one gets pushed into its own book.
2. Godunya and the East. Same deal as above.
3- Pamalt and the South. Same deal – I toyed around with including Pamalt in this book, even wrote up his cult. BUT I've concluded that it would make far more sense to include Pamalt and his version of the pantheon in a Pamaltela facing book.
4. Minor gods of purely local importance, such as Pavis, Lanbril, Flintnail, other city gods, etc. These are better placed in their settings.
Deities that can be better handled as masks or variant names of other deities, e.g., Elmal, Buserian, etc.
So what is left? Well the book is more than 50% bigger than what was previewed at GenCon and has been pretty intensively revised. Here's the current list of cults that are definitely in it (cults are listed by elemental grouping and not alphabetically):
1. Kyger Litor
3. Argan Argar
5. Xiola Umbar
6. Zorak Zoran
15. Babeester Gor
16. Caladra & Aurelion
20. The Grain Goddesses
21. Hykim & Mikyh (includes Telmor and Basmol)
22. Maran Gor
24. Ty Kora Tek
37. Chalana Arroy
40. Lhankor Mhy
41. Daka Fal
47. Storm Bull
51. Seven Mothers
52. Danfive Xaron
56. Hwarin Dalthippa
57. Irrippi Ontor
60. Red Goddess
61. Yanafal Tarnils
62. Primal Chaos
65. Crimson Bat
I am still debating about whether to add Horned Man, Triolina, Subere, Wachaza, and Voria to the list.
For me this has been comparable to writing the Guide – especially realising how these various groupings of gods overlap, intersect, and form a magical whole. Even in the West, South, and East, these are the deities that form the cosmic foundation (although often with different names and different stories).”