No date announced yet. There is a previously released teaser PV here that you can check out. Synopsis of the first season from AniList:
Saitama has a rather peculiar hobby, being a superhero, but despite his heroic deeds and superhuman abilities, a shadow looms over his life. He’s become much too powerful, to the point that every opponent ends up defeated with a single punch.
The lack of challenge has driven him into a state of apathy, as he watches his life pass by having lost all enthusiasm, at least until he’s unwillingly thrust in the role of being a mentor to the young and revenge-driven Genos.
Honestly as long as we don’t get a repeat of the source-engine-physics-glitch SFX of season 2.
Is it just me or does that P look like a D? One Dunch Man, can’t wait.
I just finished my rewatch last night
King engine starts rumbling
Tragic twist: Overusing his King engine increases his risk of heart failure.