Announced at New York Comic Con 2019 with a slew of new Star Wars books coming soon is an upcoming Thrawn trilogy entitled The Ascendancy Trilogy. The book will be coming out in May, 2020. Here is what Zahn had to say about the book on his Facebook page:
“The first book in a new trilogy set before Thrawn traveled to the Empire and became a Grand Admiral. Journey to the Unknown Regions and learn more about Thrawn’s origins and his home: The Chiss Ascendency.”
Timothy Zahn, 10/4/2019, Facebook
The Ascendancy Trilogy
For all of those fans hoping this will help to explain what happened to Thrawn and Ezra after the finale of Rebels and the last Thrawn trilogy fans are going to be sorely disappointed since this is a prequel to the current series of Thrawn Canon books.
Thrawn, a beloved Legends character, was returned to Canon through the work of Dave Filoni and crew on the TV show Rebels and expanded upon by a new trilogy of books by Timothy Zahn, author of the original Thrawn novels. These books include Thrawn, Thrawn: Alliances, and Thrawn: Treason.