Recently, Bleeding Cool reported that Swamp Thing would be returning permanently to the ostensibly-all-ages DC Universe line of comics, away from the mature readers line, Vertigo, after a couple of decades.
While the story hasn't been confirmed, the cancellation of a new five-issues-written Vertigo series by China Mieville has been.
Well, I understand that Swamp Thing may make his first reappearance in the DC Universe in Ethan Van Sciver's yet-to-be-announced Plastic Man book.
And you can expect a new ongoing series that's fully immersed in the DC Universe to follow on the back of these appearances.
UPDATE: Ethan Van Sciver posts in the comments;
This is fantastically incorrect, for like 5 different reasons! Unless it's a joke….?
Maybe. In this case it's a joke that came from an impeccable, high placed source. Unless of course it's some kind of composite story…