The official Star Wars Twitter page has updated with announcement that a sequel novel for Grand Admiral Thrawn is in the works by Timothy Zahn. The novel is set to release next Summer, however no other details are confirmed at this time. The novel is a sequel to the Grand Admiral Thrawn novel that was released earlier this April.
Grand Admiral Thrawn will return… next summer in a sequel novel by Timothy Zahn featuring a very special guest*. #NYCC
*Darth Vader pic.twitter.com/GglZb5zM7f
— Star Wars (@starwars) October 6, 2017
Seeing as I just finished the first novel it is awesome to see that a sequel novel is already in the works. I cannot wait to see what is next for the character.
Source: Star Wars