The "sleeping god" tied to Genesis is the god of the Phantom Zone, Aethyr
He was namedropped in the 2021 Annual, where he warped everyone in the Phantom Zone into monsters just like the Genesis fragment did to the Atlanteans that studied it. The Phantom Zone is said to be a realm he crafted in his dreams, with Maric referring to Genesis as being connected to visions of a "sleeping god". The hooded figure helping Mongul is Metron
PKJ has said that there will be ties revealed between the Warworld Saga and the Fourth World, and the hooded figure being Metron could be that connection. He knows things about Warworld that nobody else seems to know, he has a particular interest in Superman for some reason, and Metron himself is something of a blank slate. He's not of New Genesis or Apokolips, meaning it's possible he could be of the original Warworld civilization.- Jossed, the hooded figure who has been helping Mongul is Kryl-Ux.
Norah Stone is secretly an agent sent by the Empire of Shadows to turn Metropolis against Superman before they strike
She mentions her family is into "green energy" and are environmentalists, the evil Batman from the Batman/Superman & The Authority one shot said they would find another way to invade Earth 0, and several covers hold hints that the Empire of Shadows is involved.