From the back cover:
"This book contains all the rules needed to play, along with background information about the people and places of the DC Universe, and including essays by Robert Greenberger, Jack Kirby, Robert Kanigher, Neil Gaiman, Dan Jurgens, and Roger Stern.
The DC Heroes Role-Playing Game, Third Edition, is fully compatible with all Second Edition products and features revised and optional rules, new Powers, Advantages, and Drawbacks, and updated game statistics for many popular DC Comics characters, Including Batman, Robin, Guy Gardner, Lobo, and The Joker.
BONUS: This book also includes a special section detailing 'The Death of Superman' and 'The Reign of the Supermen', including information and game statistics for Doomsday and the four new 'Supermen'."