I would be a bit disappointed I think if her power could work in the womb before manifesting as usual at the puberty. Or eiyher if Destiny was lying : I'd prefer reading that scene as a very sincere discussion!
So about the two mysterious black panels, maybe the first one is related to the quote of Apocalypse at the beginning of the issue. I could see the two lovers - with their huge knowledge of Celestial and other various tech - breaking the first rule (or making the first step to break it) : I mean how Moira's mutant power is set and what Destiny read. Making the first step to make her "eternal".