^couldn`t find the actual trailer,so this should do for now >.>
One Punch Man Season 1 ended with a legendary fight between Boros and Saitama. Boros lost as expected but One Punch Man Season 2 is coming soon and is going to have all the new villains and fights beyond our expectations are expected.
History: One Punch Man was originally a manga which was released in 2009 and then it was considered by Murata Yusuke, who did a great job by adopting One Punch Man manga into anime.
The season 1 did a great job and received so much love by Otakus from all around the world which persuaded Murata Yusuke and his team to start their work for the upcoming season of One Punch Man, which will make us able to see the anime being premiered sometime around November or December.
Furthermore according to Anime Corner, One Punch Man Season 2 might be coming soon based on the tweet by Yusuke Murata posted on this twitter account on Dec. 13, 2015.
Original post: Dakocap