As of the time of the announcement, the season was in production and the showrunners stated that it will focus on a smaller group of core characters. Later, Brandon Vietti revealed that they will be doubling down on the core season one characters that fans already know and love.
On September 5, Greg Weisman said on DC Daily that season four would have 26 episodes, and that there would also be another time jump.
By October 2019, voice recording was already underway and storyboarding commenced two months later.
On February 9, 2020, Weisman announced that they had eleven finished scripts, six episodes recorded, but none animatics completed.
On March 3, Weisman updated that they have twelve scripts completed and eight episodes recorded.
On September 9, Weisman reported that they have 23 out of 26 scripts completed. There are currently no finished episodes, though they have been "working hard" during the pandemic.
On September 12, Weisman stated in a Q&A session during DC Fandome that their team has been working from home on season four. Pre-production was still underway despite the COVID-19 pandemic, but voice recording was being done individually by voice actors rather than in group sessions.
On September 19, Weisman said that 24 of 26 scripts were completed, with 20 episodes being fully recorded and 3 being partially recorded.