So this is the cover to Action #987, part 1 of the Oz Effect.
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I'm thinking that this inadvertently revealed Oz's identity. What if BleedingCool got it right, and Oz is actually a pre-Criris character trying to piece together Superman's various timelines, but isn't Jor-El> What if he's pre-Criris Lex Luthor?
If that would be the case, I would get serious Secret Wars vibes from The Oz Effect, and Doomsday Clock, because at the end of the day that story was about Reed and Dr. Doom's struggle and their role in MArvel's entire history, serving as fitting ends for both characters. If the entirety of this Rebirth/Watchmen story all along was about the decades long battle between Superman, the first hero, and Lex Luthor, his ultimate enemy, we could be in for something truly special.