In a report from Deadline, Nick Zano has been cast in Legends of Tomorrow Season 2 as Dr. Nate Heywood. Heywood is the grandson of Commander Steel, a Justice Society of America member.
In the comics, Heywood becomes Steel/Citizen Steel and also joins the JSA for a time. The CW has not confirmed whether or not the character will take the superhero persona in season 2, but considering the JSA is appearing it is highly likely that he will appear as Citizen Steel.
Nick Zano joins as one of two new series regulars for season 2 after the show lost Hawkgirl, Hawkman and Captain Cold. Wentworth Miller will become a recurring character on both The Flash and Legends of Tomorrow next season however, which will be interesting after Cold died last season.
Marc Guggenheim previously stated season two will have changes to the composition of the team, as well as featuring the JSA. It’s unclear as to whether JSA members will join the Waverider team, or remain separate, but many new superheroes will have to be cast regardless.