You can now pre-order The Heroes of Olympus: The Demigod Diaries on Amazon. The book will be a supplement to the series much like The Demigod Files and includes short stories, interviews with the characters, and games. Amazon gives this description:
What dangers do runaway demigods Luke and Thalia face on their way to Camp Half-Blood? Are Percy and Annabeth up to the task of rescuing stolen goods from a fire-breathing giant who doesn’t take kindly to intruders? How exactly are Leo, Piper, and Jason supposed to find a runaway table, dodge a band of party-loving Maenads (who just might be a little psychotic), and stave off a massive explosion…all in one hour or less?
With his trademark wit and creativity, Rick Riordan answers these questions and more in three never-before-seen short stories that provide vital back-story to the Heroes of Olympus and Percy Jackson books. Original art, enlightening character interviews and illustrated profiles, puzzles, and a quiz add to the fun in this action-packed collection that is sure to delight legions of loyal fans.
The book is set to be released August 14, 2012.
The next installment into The Heroes of Olympus series, The Mark of Athena, will be released Fall 2012.
Thanks to The Ultimate Percy Jackson Fansite for the tip!