'Arrow' EP has Bad News for Constantine Fans
Asked during TCA whether Constantine will return via the CW, Greg Berlanti has said that conversations about the character haven't even been had.
"Constantine exists in a certain place in the DC world and universe... [higher ups are still] internally examining what they want to do with that character next."
Petitions and fan support has made it clear that the series is a highly sought one for viewers, though ultimately none of us have a say, and we'll have to wait and see.
Source: Comicbook