I must say the lack of Sylvanas in the book was one of the things that make me dislike it, as weird as that is. I was expecting some insight, a hint at an explanation at least, but these two pages were just same old, same old. Maybe this is indeed because there is no deeper meaning. Sylvanas wants to destroy the universe because she is a psychopath, in her own way breaking the cycle, just in a much more final way. Then we stop her. The End.
If this holds true I reaaaaally hope that it will not be dragged out over the entire expansion with us hunting Sylvanas from Raid to Raid. Finish her off in the second Raid and hope that the Jailor has a more interesting plot behind him.