A Fourth Book in the Inheritance 'Trilogy'

Random House has announced that there will be a fourth book in Christopher Paolini's Inheritance Trilogy (I guess it's not a trilogy anymore. . .). The third book will be released in September 2008; there is no release date yet for the fourth book. Paolini, who started writing the series when he was 15, says he realized that he wouldn't be able to fit all the things he wanted into book 3, necessitating a fourth book: "In order to be true to my characters and to address all of the plot points and unanswered questions Eragon and Eldest raised, I needed to split the end of the series into two books." You can see a video announcement of the news on Paolini's website, here.