'Can't fear your own world'
"This article Contains Spoilers Took Place After bleach manga Left Off "

With four out of the seven previews out, I thought it may be time to gather all the scattered information together into one post.
First off, I would like to thank Missstormcaller, u/schneizel and LoN for providing translations and summaries and u/hypnodarkrai for providing the chapters. Without them we probably would have to rely on inaccurate summaries for years, like it was the case with Spirits are forever with you, which surprisingly turned out to be a well written book.
But now, without further ado, let's start with the information:
Title: Can't fear your own world
Author: Ryoga Narita
Released previews: 4 out of 7
Release of the physical book: August 4
According to Narita, Kubo did provide information and details for the novel, which makes it canon. At least when it comes to the reveals.

Synopsis and previews:
Synopsis 1:
A secret left behind par Tosen will lead Hisagi to a fight against a secret enemy and the discovery of the truth behind the world, the Spirit King, the noble families, Ginjou and the Arrancar.
Synopsis 2:
Serialisation will commence every other week!! (referring to the Bleach app) Remaining mysteries will become clear…
Hisagi Shūhei, vice captain of squad 9 and editor-in-chief of the Seireitei communication, is the main character.
Rangiku: “Wait a minute!! Why is Shūhei the main character!!
Shūhei: "It’s inevitable isn’t it?!! Even I would like to use Bankai!!”
An assassination attempt aimed at the four great noble clans. An unknown Shinigami attacks the Quincy and the Arrancar that survived in Hueco Mundo. A rapidly growing, mysterious religious group in the Human World…The turmoil in each of the three realms of existence was rooted in the new head of the Tsunayashiro family, one of the four great noble clans. Apart from being a shinigami, Hisagi Shūhei approaches the case from a journalistic viewpoint. However, he does not yet know that he is trying to touch the fearful secrets of Soul Society itself…!!
Narita Ryohgo’s comment:
“Many scenes were based on directions I recieved from Mr.Kubo personally. I will do my best to be up to the task of extensively conveying the charm of Bleach even further!”
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Bleach Allstars (ie the important characters):
Hisagi Shuhei (MC)
Kaname Tosen (flashbacks)
Sousuke Aizen
Kugo Ginjou
Grimmjow Jaegerjaquez
Tier Harribel
Giselle Gewelle
Bambietta Basterbine
Shunsui Kyoraku
Tokinada Tsunayashiro: The big bad and the ex-husband of Tosen's friend
Hikone: Protegee of Tokinada and candidate for the position of the Spirit King
Unkown leader of a mysterious sect: a dit to be a miracle worker
Michibane Aura: Sister of the leader
Available parts so far:
Part 1: link
Part 2: link
Part 3: link
Part 4.1: https://www.reddit.com/r/bleach/comments/6g3hz9/translated_the_first_bit_from_chapter_4_of_the/
Part 4.2: https://www.reddit.com/r/bleach/comments/6g6rfq/the_rest_of_chapter_4_i_apologize_for_all_the/
Characters so far stated to have survived:
Giselle (heavily implied)
Bambietta (heavily implied)
Yhwach's corpse is the new Soul King. Squad Zero put a lot of barriers and seals into it and transported him to the Soul Palace. It is heavily implied that something similar happened to the old Soul King and that Yhwach is not gone for good and still has an influence over the world. His body parts may also possibly be alive. Of course no one knows what actually happened between him and Kazui, why it happened and what the consequences will be
The general population doesn't know this. They were told that Squad Zero successfully protected the Soul King and that he never died.
Shunsui and Ichibee initially planned to make Ichigo the suivant Soul King. They would have cut him up. Shunsui didn't like it much, Ichibee didn't care. He only trained Ichigo for that in the first place and honestly didn't expect him to win. He joked that it would be a bit boring if Ichigo could not speak for all eternity. It was luck, because Yhwach had decided to change his plans and absorb the Soul King, that saved Ichigo. That's also what the soul tickets were there for.
The history and origins of Soul Society are all based on lies.
The actions of Squad Zero regarding the truth and the Soul King will be put into question in ten (the epilogue) ou 100 (when Soul Society is going to have 100 days without night thanks to Ichibee) years
The ancestors of the five noble families committed an original sin regarding the Spirit King and it is their will that Squad Zero obeys to, not the Spirit King. It's one of the reasons why Aizen was so angry at the end of Deicide. Shunsui himself hates the ancestors.
Squad Zero actually died, but was revived with the same trick as Ichibee. The reason for this is that they are kinda fused through the Oken with the Soul Palace.
Nel rescued Harribel, who was transported alongside the rest of Yhwach's château to the Royal Realm
Kira is still a zombie and the events of the 13th Blade story actually happened
The Quincy of the Wandenreich are now living in Hueco Mundo
Their relationship with the Shinigami improved and is entering a new age thanks to the death of both kings
Lille survived the fight against Kira and the destruction of the Seretei and caused trouble for several days. Eventually the birds were removed from the Seretei. They are presumably living in Hueco Mundo alongside the other Quincy.
Shuutara's invention was most likely the Shinigami uniform
Orihime's power has three limits: She can't heal someone who had mortal wounds for a long time, though the exact time frame is unknown, at least the duration of a night, was no problem for her. She can't revive someone whose body and Reiatsu are gone. And of course her mental will and stamina.
Kensei and Rose were actually dead. Mayuri's science is just that good. Though it took almost six months to revert these two back.
C46 has only few members left and did many reforms
There is actually a council of nobles that is above C46
Ichigo got his powers back within a short time
Tosen knew the truth behind Soul Society, it's why he sided with Aizen in the first place
Komamura is still a wolf
Ryuken is financing Uryuu's studies, but beyond that their relationship and what happened to the dads after their sons got jobs is not known.
Hitsugaya became a captain two to seven years before the story
The Tsunayashiro family is the fourth member of the five grand noble families
Tosen's friend is called Kakyou. Her husband Tokinada was a minor member of the Tsunayashiro family and thus not punished par the law for his crime
Ginjou is an acquaintance of the Shiba family. He, Tsukishima and Giriko are living there as freeloaders.
They kept their clothes and weapons because of their ability to manipulated souls.
The death of Kaien and Isshin's disappearance were major contributions to the fall of the Shiba family
Tsukishima cannot create new people in memories. He can only insert himself and/or replace others. This implies that the cousin he replaced in Karin's and Yuzu's memories was Uryuu and grandfather Rin was an alias of Soken. So Ichigo first met Uryuu during the funeral of Soken. He can't remember though.
Ginjou was innocent. A Shinigami was sent to assassinate him. That Shinigami killed all of Ginjou's Friends and Ginjou killed him in a fit of rage. Finding out about that plus the truth behind the Shinigami badge led to him rebelling. He went to the Seretei during the final arc in order to know the truth. But thanks to the Kamikake Ukitake was dead and could not speak. Ginjou still doesn't know why someone would want to assassinate him. It's implied the order came from high above. Ukitake is a major suspect and Ginjou believes it was him, but so far there is no confirmation.
Hanatora was the one who healed Urahara's eyes
His brother Seinosuke is alive. He is medical attendant for the Great noble families
Shino (the female Shinigami substitute and partner of Yuki, that Ichigo saved in the beginning of the final arc) is the little sister of Ikkaku. Her full name is Shino Madarame.
Shino and Ikkaku Lost their parents at a young age in the Rukongai. Ikkaku decided to become a Shinigami and Shino followed him. He was immediately accepted into Squad 11. Shino had to go to the academy first until she was accepted into Squad 13.
The earthquakes that the death of the Soul King caused, led to the rise of several religious end-time sects.
Yukio became the boss of his company after six months and thanks to his experience with Ichigo in the final two arcs, he decided to use it to help humanity and make a better world
The story thus far:
Yhwach is currenntly being prepared for the lynchpin ritual par Shunsui and Ichibee. Grimmjow, Nel and Harribel witness this. Harribel is disgusted and agrees with Aizen on that matter. They leave.
After Oetsu woke up, he found out that someone a volé, étole a sword from him. That sword is called Ikomikidomoe. The sword is usually hidden under an ocean. But that evaporated when Ichigo got his new Zanpakto. The thief was able to use several different abilities, which should be impossible. Oetsu thus concludes that the thief was from the great noble families. The sword is dangerous.
Several days after Yhwach's defeat Aizen is imprisoned back into Muken. There is a new chair. He wants to speak with Ichigo, but Shunsui and Urahara did not let him under suspicious pretense. Shunsui in general was rather adamant about Aizen not talking much and being sent to Muken as quickly as possible. Hisagi brought up Tosen and he and Aizen talked about the true nature of Tosen, why he killed him and the original sin of Soul Society. Shunsui eventually ended the conversation and sent him back.
Six months later and Tokinada just woke up from a dream. It was his first encounter with Tosen right after the funeral of his wife. He fondly remembers sending him into despair and crushing his hope (and a few bones). He notices that the members of his family were assassinated, but the assassins were also all killed par Hikone except for one. He reveals that he hired them in order to fabricate him becoming the suivant head. He kills the assassin and prepares to make himself the new head and Hikone the new Spirit King
Hisagi visits the Shiba estate for an interview with Kukaku. He wants to give a through and objective as possible rapporter on the events of the war. Kukkaku says she wasn't much involved and he should speak to Ganju, but he is useless. He ends up drinking and talking with Ginjou, revealing part of his past.
Hisagi is headed back to Shunsui's office alongside Kensei in order to cover the coronation of Tokinada. They suspect he was behind the deaths of his family.
Keigo and Mizuiro are attacked par a crabe Hollow. They are saved par Yuki and Shino (though Mizuiro was plus important for the defeat). Urahara's merchandise actually works. The four talk. Muzuiro somehow knows about the Royal Realm. They mention a religious sect.
Yukio is visited par the sister of the leader of the religious cult. The woman was a main benefactor for Yukio's company. She wants him to join. He refuses because he believes she just wants his money. She leaves but gives him a calling card "Religious sect: X-cution".