For all the fans of Eragon, Christopher Paolini's final book in the Inheritance cycle will be published this autumn. The fourth book, to be called Inheritance, will be published by Random House Children's Books on 8th November 2011 worldwide. Paolini has promised, without giving away any of the plot, that all will be revealed.
The first three books are due to be reissued in paperback on 7th July with new cover designs. http://www.thebookseller.com/news/paolinis-inheritance-cycle-be-completed-autumn.html