"In fact, I'm ... delivering another draft today," Guggenheim (TV's Flash Forward) said in an exclusive interview on Friday. "So it continues to move forward."
Beyond that, Guggenheim remained tight-lipped. "You know I really can't [say anything]," he said. "I've sworn a blood oath of secrecy in relation to the project. But, you know, the thing I can tell you is that it is a very loving and respectful approach."
Guggenheim added: "The goal here is to do the best cinematic representation of the Green Lantern character. You know, there's no desire on anyone's part to completely change the character and just call this other character Green Lantern and try to ... draft off the name recognition. This is all about 'How do we bring the best version of this character to the silver screen?'"
As for the movie's source material, Guggenheim said, "We've drawn heavily from ... a lot of different sources in terms of the comic books. ... The character ... is several decades old, so ... we've really had an incredible amount of source material to cherry-pick from."
As for casting of the iconic character, rumors have centered on such of-the-moment actors as The Hangover's Bradley Cooper and Star Trek's Chris Pine. None are true, Guggenheim said.
"They're all false," he said. "I mean, they're all false insofar as we haven't chosen anyone yet. They're still in the negotiations, you know? There's a lot of names being talked about, and there's a lot of people being met, and a lot of ... actors reading the script. But if you read online [that] Pauly Shore's been cast as Hal Jordan, I can guarantee you we have not cast anyone."
UPDATE Ryan Reynolds will be Green Lantern!