When Will Swamp Thing Come Back?

Just who owns Swamp Thing? After being asked about the chances of a revival of everyone's favorite muck monster at today's Vertigo panel, DC's VP of Sales told the following story:

Every now and again, there's a battle between [DC Universe] and Vertigo about who gets to publish the character. DCU guys go up to the Vertigo offices with the issue of Batman where Swamp Thing appears and say "Clearly this is a Batman character!" and suddenly there are pitchforks and they're forced back to the elevators.
Trying to offer a more serious answer, editor Bob Schreck said that it was one of his favorite comics, but after about three failed attempts to bring back the character, he's realized that "maybe you shouldn't go home again."