Dave Filoni, Sam Witwer, and Tiya Sircar were on the main stage at Star Wars Celebration London. They revealed the full trailer for Star Wars Rebels season 3 as well as two clips (see the official announcement and trailer here). The big news for Star Wars fans is that Grand Admiral Thrawn, a character that was a part of the expanded universe (which became part of the “Legends”) will now be a part of the official Star Wars Cannon. The character was originally created for the Star Wars novel “Heir to the Empire” by Timothy Zahn. The character quickly became a fan favorite and has appeared in numerous books and will be the feature in a solo novel titled “Thrawn”, written by Timothy Zahn. That cover was also revealed at Star Wars Celebration.