Probably its about Suramar but Darnassus and Undercity cities of eternal night too. I mean did you even saw sunlight there?Day will break over the city of eternal night.
It maybe about Anduin but i have theory what wolf cub could be Varian. I mean hes Goldrinn's scion - something like a mortal version of wild god. And if Genn dies in Legion at some point and Varian somehow survives Broken Shore Wrynn can become new worgens leader. Tess is human and like i said worgen part of Gilneas need wolf king to lead them. OR Imagine if Anduin will be forced to take worgen curse? It will be unpredictable for his character progression.The wolf cub will inherit a bloody pack.
Hakkar Soulflyer?The crooked serpent with no eyes is watching from the endless sky.