Wait, DC has brought Constantine back into the main continuity? Or rebooted him, I guess? It makes me wonder what the fuck they can do with him outside of Vertigo, which is much less limited by the need to be kid-appropriate.

It wasn't Ennis who wrote the issue where John is revealed as bi, it's a one-off writer named, as I recall, John Smith. (Which now makes me suspect that some version of the Doctor--maybe Eight when he had amnesia?--had a stint at writing comics.) It may well have had Ennis's approval though since he was the main writer at the time.