Since nobody has done it yet....
Spoilers, I will just concentrate on the Wonder Woman Mythos part.
We get some backstory with Grail and Myrna. Grail was born at the exact same time as Diana, but Zeus made a point to protect Themyscira/Diana from his enemies. (We still don't know how Darkseid comes to mate with Myrna or even why.)
Myrna has shown that the Amazons are super strong and super fast, by her casually destroying a tank with her bare-hands and deflecting Grail's omega beans with her bracelets. It almost is like Myrna has had some adventures somewhat similar to the Golden Age Wonder Woman, which was alluded to by her trophy room, and even a possible lover, until Grail not being able to help herself destroys them. Myrna believes there is good in Grail.
Grail wants Steve for something because of prophecy of him being the first Man to set foot on Themyscira, and she's performing a ritual but right before she starts it, Myrna is trying to warn her that he isn't the first man to set foot on the island. Steve gets transformed into a "New God"?
(Oh and some Power Ring/Cyborg stuff happens...eh.)