[spoiler]The second one may well be Kara with Lee(?) finding her “old” viper on Earth and him asking her - “what does it mean?”
The “we think the FC is…” could be a red herring. Lee seems pretty smug about whatever it is, and pretty pleased with himself when Zarek asks him what that was all about.
It’s been a long time since we have seen a glowing spine. And then only in a fully adult, manufactured skin job. So now we have a fetus with a glowing spine. IF that means anything, then clearly we have pure skin jobs or mixed humans/Cylons, who seemingly are conceived and age. Of course we already knew that about the latter group.
Tough to say whether the picture is merely “symbolic” for the show (like The Last Supper photo) or inidicates that we have “another” out there yet to be born. One thing seems clear (which means it may not be) - the fetus is not in utero.[/spoiler]
By the way, if you still are wondering - there is more than one Ressurection ship. Razor occurs before we encounter the Ressurection ship, when the plan is thwarted by Helo to “infect”, it with the encephalitis viris. If not, how would the humans know the purpose of a Resurrection ship at that point in the saga?