Constantine Season 1 CW Seed Trailer
The first (and only) Season of Constantine comes to CW's digital network CW Seed.
Regarding more live-action, I did speak with Matt Ryan recently who did say he would be up for more Constantine.
Hopefully if The CW sees a good turn out for their CW seed Constantine animated series and Season 1 reruns, they'll eventually green light a new live-action series. I'm guessing if Constantine debuted on The CW network first and not NBC, the series would still be around.