According to Lucasfilm, The first books and comics are set to debut at Star Wars Celebration Anaheim in August 2020 with Star Wars: The High Republic: Light of the Jedi, a massive interconnected story that’s told across various formats by various publishers.
“Charles Soule’s adult novel Star Wars: The High Republic: Light of the Jedi and Justina Ireland’s middle grade novel Star Wars: The High Republic: A Test of Courage will both now release on January 5, 2021.
February 2020 saw Lucasfilm pulling back the curtain on the next phase that they’re exploring through books and comics with Star Wars: The High Republic.
New release dates for Marvel’s Star Wars: The High Republic series and IDW Publishing’s Star Wars: The High Republic Adventures series will be announced at a later time.”