The lead female character will be Carol Ferris, who is described as "26-32, a smart and attractive woman with an MBA. She started as a pilot and now runs Ferris Aircraft. She is a work-a-holic." That's not straying too far from the comics, as Ferris was the Vice President of her father's company, and was responsible for hiring the handsome Hal Jordan. Naturally, they fell in love but things became rather problematic when she became the villainous Star Sapphire. You might just be seeing the origins of a sequel here.
Next up is Dr. Hector Hammond, "27-35, Character actor who is austere and impersonal, he is real "scummy." He is a pathologist and also the son of a Senator." Hammond is definitely getting a movie makeover, as he's just a petty criminal in the books. Being a comic book, he naturally stumbles upon radiation and uses it for his own moneygrubbing ends, and jumps into supervillain status.
Sinestro is a given, since he's assigned to be Hal's mentor once Jordan joins the Green Lantern Corps. But with a name like Sinestro, you know he isn't going to be a gentle Obi-Wan Kenobi type. I won't get into details, but it's amusing to read what his big screen appearence may be: "Mid-30s to Mid-40s, he is smart, tough, intimidating and in great physical shape." (He was based on David Niven! Intelligent, intimidating sure -- but ripped?)
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Lastly, we have the great Abin Sur. "Mid-30s to mid-40s, he is a great warrior." Again, this is no surprise since he is the Green Lantern who bestows the ring onto Hal Jordan. I'm guessing they're going to leave him fairly mysterious and not give much of his pre-Lantern past, but let's hope they cast someone with a lot of presence.
So, there you have The Green Lantern line-up. There's no major surprises, and it looks like they're going to stick to Jordan's classic origin story. The inclusion of Hammond suggests they'll be going with something closer to last year's Secret Origin storyline which would certainly help newcomers when they visit the comic shop. Now, I hand it over to you Lantern fans. Go crazy with your fantasy casting, or complain about where you already see deviations from the books. It'll be the most fun we have until they actually do begin casting and photographing everyone in costume.