DIKOWT DOWG
Man's Best Friend
I don't think she necessarily has to be a white walker. The Night King was human at some point after all. She could just be a Stark, the Night King himself might even be one. I could even see some crazy twist where the NK was actually Azor Ahai and part of him saving the realm required him not only to sacrifice his love Nissa Nissa but also sacrificing himself to balance the power that he destroyed by becoming the new NK. Maybe he didn't know about the later before sacrificing his wife so maybe he is coming for his bride Nissa Nissa as far fetched as that might seem.
Probably not but the Stark thing might have some validity.
I've sort of like the idea of somehow the NK being Rhaegar Targaryen. It fit the whole 3 heads of the dragon theme without them needing to make Tyrian a Targaryen. Plus, he'd have a claim to the throne and simply be part of the game. I don't really see how this would work with out some wacky time travel thing though.
Overall though, I am convinced, his motives are more tied to back when he was human rather than him being the king of the undead and just wanting to wipe out everyone. The ultimate manifestation of humans drive for power gone mad.
neat suggestions.
there are so many ways to go with this. what we know is the movie has already departed from legend and the books. but for a while now, i've believed all of the humans so broke, they can't win this. and a story where human kind comes together just in the nick of time, or from the ashes rises a hero that kills off the NK and Sercei's of this world, doesn't seem likely.
the ending will be shocking, and maybe even sickening.