What is psycho-pass season 4?

As an AI language model, I do not have access to information about Psycho-Pass season 4 as it has not been officially announced yet. The third season of the anime series was released in 2019, and there have been no updates from the creators about a possible fourth season. However, fans of the franchise can look forward to the upcoming mobile game, Psycho-Pass: Sinners of the System Case.3 Beyond Love and Hate Chapter, which is set to release in Japan in summer 2021.