"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."
The film is expected to be directed by Martin Campbell, who stepped in for Berlanti, and is slated to begin production at Australia's Fox Studios in Sydney this summer for a release on June 17, 2011.
Guggenheim confirmed that his script will focus on Hal Jordan, based on the Silver Age DC Comics incarnation of the superhero, and how he became a member of the Green Lantern Corps.
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."
CLICK HERE to read more from Guggenheim, including some casting rumors he addressed.