We learned yesterday that Timothy Zahn’s Thrawn novel will be a prequel to the character’s Rebels appearance, but Zahn gives a more specific timeline in a quick interview on StarWars.com.
The novel begins “with his first encounter with the Empire,” and ends just before his Rebels debut, Zahn says. (A new take on Outbound Flight, maybe?)
Zahn also reveals just how much he’s seen of the Rebels appearance (about as much as we did) and whether we can expect anything from his Legends books.