Well, the "whole of New 52 history" has been about six years long, right? So whoever this guy is he might have been born during or out of the Flashpoint.
But I mean, we knew that, kind of, as far as "whoever he is is related to the temporal/flashpoint/rebirth paradox" and duplicates and stuff going on.
The bleeding Superman logo is meant obviously to homage Death of Superman, but Prime also burned a bloody S onto his chest, so, it's a really solid notion. A little too solid, perhaps. I'm eager to find out.