Shigenori Soejima Artworks isn’t the only Persona-related art book that Udon are publishing. Amazon also list two other books — Persona 3 Official Design Works and Persona 4 Official Design Works — both slated for release sometime after December 25th.
Both books are priced at a little over $26, and are available for pre-order. They contain character designs, rough sketches, backgrounds, and interviews with the developers.
A big thanks to Kimberly for the heads up!