Apexis Scroll - This battered scroll case has corroded shut, and the scroll within is barely readable with very careful examination. These appear to be plans and measurements for a glorious Temple in the Sky written in an ancient hand. It's unclear whether such a splendid structure was ever built.
I think at least one of the middle expansion raids will be Arakkoka themed, but this might even reference it (were plenty of hints about ToT in Kun-Lai questing)
Of course we'll probably want flying mounts to get there. =p