no
The release date has not been published yet.
The full first chapter of book 4 in the inheritance cycle has not been released yet. However, you can get a sneak preview at Shurtugal. com or inklet.blogspot.com
christopher paolini is currently writing the 4th book of Inheritance. he mentions that it will have a green dragon on the front cover and the title will be something that eragon inherits. there are no dates for when it will be released yet.
The fourth and final book of The Inheritance Cycle is titled Inheritance. It was released by Alfred A. Knopf publishers on November 8th, 2011.
He is the author of the Inheritance Cycle... fantasy books based in the land of Alagaësia. The first is called Eragon, the second Eldest, and the third is Brisingr. The fourth has yet to be released.
Murtagh is a character from the Inheritance cycle, not Harry Potter. Christopher Paolini has not released his fourth and final book yet, so there is not an answer to your question at this point.
November 8 2011 as Inheritance.
As of now, Christopher Paolini has only published three books in the Inheritance Cycle series: Eragon, Eldest, and Brisingr. There has been no official announcement or release of a fourth Eragon book.
The book The Goddess Inheritance by Aimee Carter is scheduled to be released in April 2013.
An Accursed Inheritance - 1913 was released on: USA: April 1913
It is released in November 8th 2011, and is called Inheritance- real orriginal!
The Boob's Inheritance - 1913 was released on: USA: 18 January 1913