It began as the ultimate voyage of discovery–only to become the stuff of lost Republic legend … and a dark chapter in Jedi history. Now, at last, acclaimed author Timothy Zahn returns to tell the whole extraordinary story of the remarkable–and doomed–Outbound Flight Project.
This book gives the reader a basic idea of what Thrawn was doing before the Clone Wars and adds another great characters, the Yuuzhan Vong or the Far-Outsiders.
There is a short story called The Mist Encounter. It is overpowered but includes the early days of the Empire. Some of the story may be co-opted for the new book.