When is Christopher Paolini bringing out his 4th book?

As of today, October 26, 2023, there is no official announcement from Christopher Paolini regarding a fourth book in the Inheritance Cycle series. He has not revealed any plans or timelines for such a project.

However, he has stated in the past that he is open to revisiting the world of Alagaësia if the story feels right.

It's best to stay updated on his official website and social media for any news regarding future projects.