At this point, who’s the rightful heir to the Throne?
If Cersei Lannister still holds the Iron Throne when she gives birth, her child will become the heir apparent. Everyone not allied with her sees Daenerys as the rightful heir to the throne, but they are missing some very important information.
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How much time has passed in the realm of the show since the pilot?
Robert Baratheon arrived in Winterfell in the year 298 A.C. (After the Conquest). Each season since is supposed to have lasted a year, which means that the Night King burned down the Wall in 304 A.C., with the last season set to begin shortly thereafter.
Do Craster’s babies grow up to be White Walkers?
While Craster’s daughters become his wives and sex slaves, his sons are taken away and left at a strange altar for the White Walkers. It is unclear what exactly happens to them, but it’s heavily implied that the Night King takes these babies and transforms them into White Walkers. Since wights are created from dead bodies touched by White Walkers, White Walkers may need to be created from living humans. They have a strong bond with the one who created them, because whenever a White Walker is killed, all the wights they created are destroyed as well. According to Beric Dondarrion, this means that killing the Night King will wipe out the entire undead army as “he turned them all”.
What is the magic within the Wall?
According to myth, after the Long Night the legendary Stark ancestor Brandon the Builder constructed the Wall with the help of giants and the Children of the Forest, who helped wove some extremely powerful magic into its foundations. Benjen Stark tells Bran and Meera that “while it stands, the dead cannot pass”.
In any case, now that the Wall has been destroyed, its magic is probably broken.