I have a hunch that they are going to go crazy and kill everyone and then everyone is going to turn into a Black Lantern but after the heroes save the day, they will come back.
Also weren't Sue and Ralph ghosts jumping into people's bodies and being happy happy? I really do hope that they're still doing that and that their zombie Black Lantern bodies are just emotionless husks being powered by their ring and previous memories and not really them.
But yeah the scene with the Zombie Dibnys was what grossed me out of this comic, that and Hand making out with Bruce's skull.