I've been re-reading parts of Infinite Crisis as well as reading up on the Monitor and COIE to try and figure out if there's anything that might suggest where Rebirth is going.
Infinite Crisis establishes something I missed the first time I read it, that Earth-One became the "foundation" of New Earth, with elements of the other four surviving Earths folded into its continuity.
Assuming that's the case, the Earth-One Superman was altered by the merger, with Earth-Two elements overwriting aspects of his past, giving us the lack of Superboy/early development of powers, and a Clark Kent who wasn't a facade for the "real" person of Superman.
Over the years, we saw elements of Earth-One return in updated forms: the Fortress, Kandor, Krypto, and Supergirl. We even got a Superboy, though he wasn't Clark Kent as a boy. Meanwhile, elements of Earth-Two also emerged, like a married Lois and Clark.
Infinite Crisis took things up a notch by establishing that Earth-One was the foundation; in the fallout of IC and 52, we saw a New Earth that was far more like its pre-Crisis self than ever before. Clark's suit was now made from blankets in his ship, he was Superboy with the Legion, Zod and other pre-Crisis/SA/BA elements returned in various ways.
Flashpoint seemed to keep some elements of Earth-One while restoring Earth-Two elements not seen post-Crisis: the Daily Star, the social crusader Superman, and even GA power levels.
Rebirth and Reborn have shown us the restoration of Secret Origin, itself a story with strong Earth-One elements restored by Infinite Crisis.
My larger point is this: have all of these events been moving toward restoring an Earth that will be far more Earth-One/Two than New Earth was? With Convergence a possible factor, we don't know if the Multiverse's preservation meant that the original 5 Earths that merged never merged or if, somehow, they did and we're seeing the "rebirth" of Earths-One and Two more than ever before since COIE. We know the JSA is returning, and it seems more and more likely the post-Flashpoint Earth-Two is going to be ignored or altered by Rebirth.
Any thoughts about all of this? Could be I'm just overthinking all of this, but it feels like the mission of Infinite Crisis that was deviated from with Flashpoint is now once again being taken up.