Check out the news that took everyone by surprise: One-Punch Man – Anime has a 3rd Season announced ! That's right! Therefore, according to the official studio website, staff and cast will be announced in the future.
Rumor indicates that we will have a new studio animating this third season of One-Punch Man.
One Punch-Man – Anime has 3rd Season announced
Updated: Rumor reveals that the Bones (Mob Psycho, Boku no Hero Academia) is responsible for the season. This way, I believe we can be somewhat at ease in relation to animation, as we all already know the competence of this studio.
Check out the official announcement image:

On the website we can read: “ This time, we will begin production on the long-awaited sequel to the 3rd season of the animation “One-Punch Man”. At the same time, an image drawn by Osamu Kubota, responsible for character design for the first and second seasons. ”
Synopsis:
The plot revolves around Saitama, an ordinary young man who discovers he is a superhero, so he goes in search of powerful people to face, however, he always ends up defeating them in seconds, with one punch. However, due to his overwhelming strength, Saitama has become bored and is constantly trying to find stronger opponents who can fight equally against him.
The first season premiered in 2015, directed by Shingo Natsume Madhouse studio (Hunter x Hunter). The second season premiered in January 2019, containing 12 episodes with animation from the JCStaff (Toradora!), as well as direction by Chikara Sakurai.
Finally, One Punch Man began in 2009 in Japan and quickly became a phenomenon with 7.9 million views in June 2012.
Via: Official Website