Premieres October 2025. The new PV is here. Check out the ANN article for additional information. Synopsis for the source manga from AniList:
In this new action-comedy, everything about a young man named Saitama screams "AVERAGE,” from his lifeless expression, to his bald head, to his unimpressive physique. However, this average-looking fellow doesn’t have your average problem… He’s actually a superhero that’s looking for tough opponents! The problem is, every time he finds a promising candidate he beats the snot out of them in one punch. Can Saitama finally find an evil villain strong enough to challenge him? Follow Saitama through his hilarious romps as he searches for new bad guys to challenge!
It won’t be, because S3 is by JC Staff, same as S2.
While S2 was high quality for a JC Staff production, compared to their usual rush jobs.
S1 was by Madhouse.
I was aware of the studio change between s1and s2. Bummer that it stayed with JC Staff.