We don't know many of the stories left to tell in Cataclysm. The future of the blood elves lies in the unpublished prose of Lor'themar Theron's short story. Sylvanas' potential madness and craziness can have explanations hidden in those words. While the Firelands will continue the story of the rejuvenation of Hyjal, we still have much to learn about Malfurion and Tyrande and the night elves in general. So what comes next?
Will these stories shed light on these leaders and their peoples' futures? Can we expect timely lore reveals through these stories that will do part of the story advancement? Personally, I'm really excited for the next story.