I just asked Brandon for a hint at the book signing. He was a little reluctant to answer a vague question, so my brother asked if the skill needed to find the easter egg is language related, or if we need to know another language to find it. He said no. I asked if it was math related (thinking that the book talks about the storm wardens use math to predict the storms), he said yes. He also said that one person just about figured it out at one signing, just looking at the map. He restated that its not anything real big, just something we might find interesting.