By using Puzzle Box of Yogg-Saron you can get a phrase: "There is a little lamb lost in dark woods" among all other lines. And not so long ago Uuna storyling was presented, in 12 part of which (Shadow of a Tear) you visit location named "A Dark Place", which looks just like dark wood and Uuna is that "lost little lamb". So it seems, that in Puzzle Box pharases are hidden clues on events conncected to Old Gods, which happened/will happen. Another example is a pharse: "The giant rook watches from the dead tree. Nothing breathes beneath his shadow". It seems to describe Black Rook Hold filled with ghosts and which stands near dead Shala'Nir.
What do you think of this speculations? And what are your thoungts about "A Dark place" location, which we visit during the quest, considering the fact, that you enter it by using green dragon tear?