The new book is scheduled to be released at the end of this year. Paolini himself has told that it would continue the story of Eragon and Saphira and in addition it will contain other stories in Alagaësia. Do you think this will turn in to a new series? Will it answer so many unanswered questions in Inheritance Cycle (like what Meona tree took from Eragon, etc.)?
It is the first book in a series, but it may not be the book you're looking for.
The full title of this book is
"The Fork, the Witch, and the Worm: Tales from Alagaësia (Volume 1: Eragon)"
As the name implies, this will be followed by other books (presumably from other narrators).
Q: Volume 1???
Christopher Paolini: Heh. That does imply a Vol. 2, doesn't it? :D
Christopher Paolini: Glad you liked it. :D There are more in the pipe.
However, this is not the "Book V" that Paolini has been teasing since 2011.
Q: Is The Fork, the Witch, and the Worm the long-discussed Book Five that you said you will write?
Christopher Paolini: No. The Fork, the Witch, and the Worm is the first volume of a new series of short stories set in the world of Alagaësia. Book Five will be set after the events of this volume.
Tl;dr Will this turn into a new series? Yes Will it answer so many unanswered questions in Inheritance Cycle (like what Menoa tree took from Eragon, etc.)? Maybe some of them, but most, including the Menoa Tree, are for Book V