A lot of people are still waiting for the release of "One Punch Man" Season 2. "One Punch Man" Season 2 will be a big hit once it's has been released. Please be advised as there will be a major spoiler here.
There are a lot of rumors and spoilers in the web in "One Punch Man" like Boros will come back, King is the strongest of all heroes, Saitama will be a villain and Saitama will loses his power. But some knows that this will not happen especially if you are updated and reading the Manga. Boros is already dead unless "One," the creator of One Punch Man will revived him.
Some did say that Boros will find the weakness of Saitama and this would be the reason of his defeat. But we all know that the only weakness of Saitama is being bald. In the Manga of "One Punch Man," Saitama will never be a villain or he could really be tag as a villain because Saitama save the life of Psykos who is currently imprisoned.
Tatsumaki wishes to kill Psykos even though she is a human, she is still a former leader of the Monster Association. Another thing that could make Saitama a villain is that when he beat Garou, he let him escape. A lot of people still believes that King is the strongest hero or stronger than Saitama, but the truth is he is the weakest of all heroes in Hero Association.
King never been in a brawl in his life. All of his achievement happens when Saitama is killing the Mysterious Beings and King is always in the scene wherever Saitama defeated them. Everyone though in the "One Punch Man" world that he is the one who is beating Mysterious beings.
Some say that our hero Caped Baldy or Saitama will lose his powers. There are no credible reports that this will happen because in the Manga, he is still the strongest. Being updated in the Manga of "One Punch Man" will really give us details but everyone knows once it has been put in the Anime, changes will be included.