Guggenheim told Newsarama:"We've turned in the treatment for Flash. And we're talking about Green Lantern 2."
He says, though, that online talk about a Green Lantern trilogy isn't quite official just yet: "It would be a quality problem to have, to think about a third. But one step at a time. I think where that came out of was, when Greg Berlanti originally pitched the movie to [the studio suits] he pitched three movies. So there's always been - and he's said this publicly - enough story for a trilogy",
"I think it's very hard to talk about these characters in a closed-ended, sort of non-sequel way, especially characters like The Flash and Green Lantern, which have such rich, long histories.You can't help but talk about the characters and go, 'Oh, I really want to do the movie where we get to this moment, or that moment.' So you're always talking in terms of sequels, but no, nothing's planned."
"I went down to New Orleans two months ago to see some of the Green Lantern filming, and I got to see a whole bunch of things in connection with the movie," Guggenheim said."In all honesty, I was completely blown away. I don't think it dawned on me how huge this movie would be until I went down to New Orleans and really saw everything that I saw. It was incredibly eye-opening. I was really rendered speechless. There's just no way for me to put it to words, just how huge this movie is going to be."
Meanwhile regarding progress on the long gestating 'Flash pic "We haven't even written the script yet... It's very much one step at a time for The Flash...nothing's planned" in terms of sequels or potential franchises as they're taking it "very much one step at a time"...