Mists of Pandaria was packed with a lot of story, each of its 'acts' dovetailing into the next. It wasn't quite as expansive as the myriad plot points that were introduced with Cataclysm, but Cataclysm also included a revamp of almost every level 1-60 zone in the game, with both quests and the stories of the zones themselves getting a shot of new story content. When Cataclysm was winding down to its inevitable end, I reviewed several of the plot points left in the expansion -- story hooks that we might or might not see addressed later. There are still many out there left untouched.
It only seemed appropriate, in the waning weeks of Mists, to do the same. Although Mists didn't have quite the variety as Cataclysm, there were still moments of potential story that were left unanswered -- tales without an ending, problems or puzzles we still don't have an answer to. And as we move forward into Warlords of Draenor, we can only wonder if, or when, we'll see these elements pop up again.
Please note: The following post contains some spoilers for the novel War Crimes.