It's just a little part they've added to the foreword where the cover explanation used to be where they say something nice about the adventure author, in this case, Jim Groves. :-)
Adam is a saint for creating the author shout-out section. I can't wait until we get to Book 6 and Thurston's and it just says "WHO IS THIS CANADIAN MAPLECAKE? WHO LET HIM IN HERE?"
It means a lot to me that Adam and Paizo want to tell people playing the AP a little bit about us authors. It shows how much Paizo values us, not only as authors, but also as people. :)