These are from chapter 120 onward according to an analysis I did from the final chapters exhibition.
EDIT: these are not official, just me trying to link things together, and mostly speculations
Chapter 120
- Eren is dead
- Eren goes to the PATHS and sees Ymir where he finds out the truth
- Ymir in the past tricked and poisoned the Devil and stole his powers
- The Devil was the only inhabitant of the PATHS, a parallel reality
- after stealing the devils power, Ymir literally created the Eldiands from scratch like in season 2 ending
- Ymir then had 3 daughters with a man she created: sina, maria and rose
- Ymir started building a huge city called Alahlav with titan crystals. (Note the city's name is Valhala in reverse)
- Ymir was betrayed by her family after 13 years of reigning on the Eldians she created.
- The Eldians finding out the true nature of Ymir tried to give the titans powers back to the Devil
- Then Ymir explains the Devil has become part of herself and she can't give the powers back
- Maria, Rose, Sina with 6 other Eldians and 1 Marleyan slave killed Ymir and ate her body in a ceremony trying to separate the Devil from Ymir's body
- 9 titan shifters were created after the ceremony, and the Marleyan slave who ate Ymir eyes was called Jom Ackerman
- The Marleyan Slave ate Ymir's eye (Ackerman), Sina ate Ymir's brain (founding), Rose ate Ymir's hair (Beast), Maria ate the teeth (Jaw), and the 6 others ate the genitals (female), blood (colossal), heart (attack), arms (warhammer), legs (cart), skin (armor).
- the shifter who ate the heart of Ymir disappeared soon and remained hidden
- it's the beginning of the Eldian empire with each family of shifters trying to gain power.
Chapter 121
- Back to the battlefield: Eren is dead, but suddenly the Attack titan keeps moving
- The real power of Attack titan is revealed: the titan is autonmous, and keeps fighting even if the shifter is dead
- It's revealed the Attack titan is actually the mind of the Devil, once the shifter (Eren) is gone, the Devil is in control
- The attack titan grabs Zeke and starts a full scale rumbling, the wall titans start leaving the island
- Mikasa goes to kill Gabi
- Reiner defends Gabi, and Magath shoots Mikasa's leg
- Mikasa is captured alive by Reiner and he crushes Mikasa's spine and paralyses her
- Armin offers himself as hostage in exchange for Mikasa's life
- Armin and Mikasa are both captured by Magath's squad
- The Attack titan holding Zeke escapes from the island by riding on a wall titan
- Yelena gathers the Military police, the Garisson and the Survey corps (including Jean, Connie and Hitch)
- There are Hizuru's army ships waiting for Yelana
- Yelena swears to find Zeke and to bring him to Hizuru
- Jean, Connie and Hitch having no choice join Yelena, with the Blouse family and Nicolo.
Chapter 122
- The paradise island is being destroyed by all the walking wall titans leaving the island
- Magath, Reiner and Pieck are back on the Zeppelin with Armin and Mikasa as hostage
- Reiner says sorry to Mikasa for paralysing her, and explains Gabi and Falco are too precious for him
- Falco finally wakes up in Gabi's arms
- from the Zeppelin they spot a survivor in Shiganshina: it's Floch.
- Armin begs Magath to save Floch
- Magath refuses, but then Armin proposes if they save Floch he will guide them to Annie
- They also spot Pixis mindless titan from above
- The chapter shifts to Hange and Levi riding horses in a field and watching the rumbling of wall titans
- Levi lost and arm and an eye but he's fine, Hange praises him for faking his death in front of Floch
- Levi says he wants to "end-everything here and now" too
- they go near a house and a farmer recognises Levi, but Hange kills him with a knife
- Levi knocks on a door
- Historia opens the door but Levi stabs her belly
- Levi performs an abortion on Historia and takes the fetus out
- Hange injects the fetus with titan serum and it transforms into a colossal mindless titan
Chapter 123
- chapter starts with Yelena on a Hizuru boat near a Hizuru port.
- Yelena and Kyomi are discussing
. Kyomi explains the Hizuru people are afraid to let the Eldian refugees in
- Yelena and the Paradise eldians have been waiting in the port for 2 months, hoping the Hizuru would let them in
- Kyomi then explains the rumbling isn't happening, the wall titans are nowhere to be found since they left the island
- Yelena then explains they're probably waiting at the bottom of the ocean
- Yelena also explains Zeke is with the attack titan among the wall titans
- Kyomi suggests that Zeke is probably dead, and that's why the autonomous attack titan can't control the wall titans anymore, because he lacks the contact with a royal blood
- Yelena smiles, Kyomi is surprised
- Kyomi also explains that Hizuru has already sent workers to extract the iceburst stone from Paradise island
- The chapter shifts back to Jean, Connie and Hitch. Jean and Connie keep complaining about being stuck on that boat for 2 months
- Then Hitch says she hasn't had her periods for 2 months, and she's not even pregnant. Connie looks at her in shock.
- Bottom text: the euthanasia plan has started