Percy Jackson series nearing a close

From PW Children's Bookshelf 1/22/09 e-newsletter:

After a four-year run, Rick Riordan’s Percy Jackson and the Olympians series—about a boy who discovers he is a son of Poseidon and embarks on a string of modern-day adventures involving ancient Greek gods, heroes and villains—will draw to a close this spring. But arriving ahead of the fifth and final book is a companion title, The Demigod Files. The paper-over-board title aims to make readers experts on the Percy Jackson universe, offering interviews with characters from the series, games, puzzles and two original short stories by Riordan.