Sometimes you just start wondering about things.
Looking around Pandaria, I've commented before that the entire continent feels like it was being segregated from the rest of Azeroth even before the sundering and the mists sealed it away for 10,000 years. Knowing what little we do about Ra-Den, the Titans and the mogu's origins, one huge unanswered question remains. Why was it all there? The Mogu'shan Vaults, the Vale of Eternal Blossoms, Ra-Den and the mogu were placed in what is now Pandaria for a reason, and we do not yet know what that reason was. We have tantalizing hints from Wrathion's dialogue that implies that the Vale was a creche of life, where the Titans could experiment towards creating new life, much as we're told is the case in Sholozar Basin and Un'Goro Crater.
Here's the issue, then: what life were they making? We're told that the Emerald Dream mirrors the face of Azeroth before the sundering, but we're never told just how far before. We're told that the Titans created Azeroth and shaped it before the coming of the Old Gods, but we're never told when the Old Gods arrived, or how long ago they came.
Just how far back does Azeroth go, and how exactly did the Titans create it? How did they shape life upon it? Why are there prehistoric creatures throughout their 'laboratories' as it were?