About a month ago, The CW announced that they were making a Flash/Arrow spinoff show with Brandon Routh (The Atom), Victor Garber (Prof. Martin Stein), Wentworth Miller (Captain Cold), and actress Caity Lotz (Sara Lance/Canary). A few days ago, A casting call for said show was put out for three heroes. This call also revealed that these would be three heroes that haven't been seen on TV before.
"A Han Solo-esque rogue who gets by with his charm, this hero hails from the future, and has journeyed back in time on a secret mission. His razor-sharp wit hides the pain of a man who has lived through serious conflict. He also harbors many secrets, always leaving both his teammates and the audience unsure of his true allegiances.”
As much as I want to believe this is Booster Gold, he has been in Smallville already. The next obvious choice would be the Time Master himself, Rip Hunter. Though he has never struck me as Han-Solo esque, maybe they can mix him with a bit of Booster's personality.