That is my guess as well.
I'm suspicious that a new book may be in the future, in spite of the comment in the prior blog post asking people to stop trying to bribe them. They're smart enough to know that giving us a tidbit like that comment about Derek is only going to make us more voracious.
After reading the two bridge scenes, I wanted to know more of the story, but I was okay if they didn't give us any more. That scene gave us something interesting, left some questions, but nothing that I personally was in dire need of answers to. Now I'm going to need some additional information. Derek is a favorite of mine.