The hints recently dropped by Geoff Johns about a new DC television series coming next year can be interpreted in a number of ways. He could be talking about an existing character getting a new series – such as Tyler Hoechlin's Superman from Supergirl – or the return of an old character like Constantine. But it seems more likely he's talking about an ongoing project we already know about, such as the Black Lightning series Deadline reported on.
While both a new Superman series and a returning Constantine series would have tremendous appeal to the DC fan base, we've known for months now that a Black Lightning superhero series was being worked on by Greg Berlanti. Berlanti and crew are the same people who brought us all of The CW superhero shows we've come to enjoy, including Supergirl, The Flash, Arrow, and Legends of Tomorrow.