Sunday at the One Punch Man festival it was announced that there will be a second season. No dates or anything yet. But it is being made.
The original season of One Punch Man aired back in 2015 in October. While it first aired on Toonami in English this last July. One Punch man has been a huge success worldwide. Still no word on the series OVAs coming to the west though. You can view the announcement tweet below-
— TVアニメ「ワンパンマン」公式 (@opm_anime) September 25, 2016