Wikimedia Commons/Mistborn movie TV Brandon Sanderson updates fans on the Apple TV Mistborn film adaptation. Get the latest on the Cosmere project's progress directly from the author. March 25, 2026 AceShowbiz - Mistborn is moving forward, with acclaimed author Brandon Sanderson recently providing an update on the film adaptation currently in development at Apple TV. Sanderson, who maintains a strong connection with his fanbase, regularly posts updates on his personal YouTube channel, which has nearly a million subscribers.