Geoff Johns Talks Future Projects, Comic Book Day, Green Lantern, Arrow, Man Of Steel, Booster Gold, The New 52, Animated Movies, And More

From Collider.com 

So Green Lantern after Justice League movie, hmmm.

Johns is asked if there are plans for another Green Lantern movie after Justice League, with his response as follows:

Johns: There are plans.  There are plans.

The Collider then goes on to state with Ryan Reynolds' involved, though Johns didn't confirm that directly or deny it.

Collider: In other words, we might see Ryan [Reynolds] in Justice League.