There is one obvious member missing from the Justice League movie, with no official word on if the/a Green Lantern is turning up. The Green Lantern Corps is planned for 2020 though, so the group is certainly on the horizon.
The Wrap have dropped a little bit of information in one of their posts though, saying that a member of the Corps will indeed be turning up in the film in a 'key scene'. There is not much more to it than that, but it's something to go on at least
Obviously, this isn't confirmed, but it's coming from an outlet with real cred, so I'm sure there is something behind it. It could really help plant seeds for the standalone movie too, so I buy it.