It looks like Percy Jackson and the Olympians is already working on the next season even before its initial one premiered on Disney+. While it is still slated for a 2024 release, it seems like they are getting ready just in case a season two renewal is around the corner as revealed by Percy Jackson creator Rick Riordan in his personal blog.
He does highlight that nothing has been green-lit but they have been approved to start work on scripts, which helps production jump straight into the next season once they get the renewal rather than going through the writing process and delaying the next season’s release even more.
W]e have started work on the writers’ room for season two. This does NOT mean the second season has been green-lit yet. It’s too early for that. But we have been approved to start developing scripts, and I think everyone’s expectation is that a second season will happen if all goes as planned. It sure is exciting to be part of the room, though. We’ve broken down the action of the second ‘Percy Jackson’ book, ‘The Sea of Monsters,’ into a series of episodes, and have begun outlining what the first episodes would look like.Rick Riordan
It’s something that a WGA entry recently hinted at for Netflix’s One Piece, as it might also already working on the scripts for its second season as well. The practice is common as it gives them shorter waiting periods between entries and it mostly means they are working on the basic season outline before finalizing any scripts once there’s a confirmation for the second season.
Source: Rick Riordan