Potential spoilers throughout the article! Nothing confirmed, but steer clear if you do not want to know anything about the DC Cinematic Universe before it all goes down.
In brightest day, in blackest night, and on March 25th, we will be getting our first brief glimpse of the Justice League on the big screen in the highly anticipated Batman v Superman: Dawn of Justice! Of course, Batman (Ben Affleck) and Superman (Henry Cavill) will be there, and by now we've all seen Wonder Woman (Gal Gadot) in action. It has also been confirmed that Aquaman (Jason Momoa), the Flash (Ezra Miller), and Cyborg (Ray Fisher) will be in the film to some capacity as well... But where in the cosmos is Green Lantern?!
The only thing that is concrete for the Emerald Warrior is a new solo film due on June 19th, 2020 (pretty far out). It is expected (with enormous hints from the studio) that Green Lantern will play a significant role in the upcoming Justice League 2, though we are probably far away from any confirmed details. As of now, and thanks to the determination of the nerd world, casting rumors are swirling!
Here comes the potential spoilers...
One unnamed fan claimed to have seen a version of Batman v Superman, and by the third act, we will see all of the aforementioned Justice League members. The review that is given has a few inconsistencies so it is probably just a rumor, but Zack Snyder himself has said it was amazing to see all of the Justice League members standing together while BvS was still in production. If it is true that Green Lantern will be in the film (and that's a big if), there is a casting rumor that has been circulating as well.
A relatively unknown actor, Dan Amboyer, is in BvS as a drone pilot flying alongside Superman... sound familiar? That's right, Hal Jordan is a notorious test pilot and Amboyer certainly looks the part. It's a little strange that they would be taking a risk on this guy with such a substantial role, but the same could be said for almost all of the JLA members in the DCEU (except Ben Affleck, who has his own fandom reservations). Regardless, aside from the World's Finest, Green Lantern is one of the only Justice League members that DC has attempted on the big screen prior to BvS, and for the flop that it was, I'm sure DC would intend to rectify the property. Nevertheless, DC and Warner Brothers have some pretty big plans for the Green Lantern Corps as a whole.
Aside from Hal Jordan appearing in the upcoming Justice League films, the Green Lantern Corps movie will be featuring more than one Earth based member of the Corps, with a confirmation on at least John Stewart. This is one of the most dynamic elements of the Green Lantern, and every big comic fan has there own personal favorite. I am excited at the prospect of seeing all of the Earth based GLs because they each bring something unique to the table, especially when dealing with each other.
If I were to take a crack at who the main villain might be, I would say Atrocitus is the most likely candidate as he played a humongous role in Green Lantern: Secret Origins by Geoff Johns, which is maybe the character's greatest storyline. It sounds like the studio wants to expand the Lantern Universe and keep the story primarily in space, which is great because that is where the character flourishes.
Some things DC should consider would be not to shy away from the source material, and utilize all of the Lantern Corps as well as their individual philosophies. Maybe look deep at the animated features and series for inspiration on handling the vast universe given that these projects were wonderfully constructed and very deep.
Take cues, but not copy the Guardians of the Galaxy since the format of a ragtag crew on a spacefaring adventure could be considered very similar. And they should not be afraid to have a little fun without crossing the line of goofy and ridiculous. Easier said than done, but that's why I write articles and they make movies. One last note, Geoff Johns has some substantial creative control at the studios and is almost without a doubt the greatest writer for Green Lantern ever. This is by far my favorite comic book character and personal hero so I really hope they do it justice (wink).