Batman:
Joker attacks Arkham with gas. We never actually see him and it's mentioned that none of the victims are laughing, I think it might be a false flag by Scarecrow. Bane is killed in the attack.
A billionaire named Simon Saint is trying to make the Magistrate program a thing and working with Scarecrow.
Wonder Woman:
Amazons are fighting over who gets to be the new Wonder Woman, Hippolyta gives them a test. Nubia wins, Hippolyta gives her the crown and makes her queen before leaving to be the new Wonder Woman herself.
Hippolyta somehow knows Yara by name, Diana has never heard of her.
Yara left Brazil when she was a child too young to remember it, she was raised by her (deaf) aunt and (white) uncle in Idaho. As an adult she's traveling back to Brazil for the first time.
Green Lantern:
Alan comes out of the closet.
John and Baz are taking Teen Lantern to Oa because the Guardians want to know why she has the gauntlet.
Superman:
Spectre has talks about Jon being unfit to be Superman, and that he could end up a tyrant, but he gets proven wrong.
Green Arrow:
Roy is alive again, but isn't ready to tell anyone.
Flash.
Barry is invited to join Justice Incarnate by Superman-23. Wally is the new Flash.
The Alpha World and The Omega World
They name the second world that's at the center of the new multiverse with the Elseworld. Earth Omega. It's described as a place of endings, where even gods die. Darkseid is back and stronger than ever, saying that all past aspects of himself have combined into one. He kills the Quintessence.
Williamson doing a rehash of Johns Rebirth issue meta commentary:
There's a little speech from Diana that's clearly a shot at Didio. "For years, our lives were infected with despair. An omnipotent force from another world manipulated us as part of some grand experiment. It stole away so much. Our sense of legacy, our connections and faith in ourselves. We believed it's lies for too long. It let worse aspects of the multiverse hurt us."