Asherons Call: So, What's that 3rd Teaser Pic?

An ACVault poster sent over a request that perhaps our lorbies could figure out what there's could not in a LONG thread of guesses. What does this picture refer to?

He was very complimentary by saying that our Lorbies seem to be the most knowledgeable so let's hope we don't disappoint. I've started a thread in the Hall of Lore for our own guesses. Lorbies get our your...uhh....books and figure it out!