Nothing has been confirmed by Warner Bros. yet, but this would be a safe, yet head-scratching move on their part. Pine is a credible action hero with plenty of likeability, but playing two separate cosmic heroes (the second being Captain Kirk in the Star Trek franchise) simultaneously could prove to be distracting.
Also, during a time when both studios are recalculating their efforts to fix the lack of diversity in the comic cinematic universe, this could be a perfect opportunity for DC to rollout the John Stewart storyline and cast a black actor to suit up as the Green Lantern. That would be badass, fresh, and game-changing.
Stay tuned as more details unfold.