Superman: Legacy may be two years away, but the movie is already generating tons of hype for itself and the upcoming DC Universe of movies. This is mainly down to the casting, not to mention avowed fan James Gunn being at the helm. Said fandom and further spot-on casting decisions have now been announced, with Vanity Fair stating Nathan Fillion is playing Green Lantern in the film.
Source:https://www.cbr.com/superman-legacy-green-lantern-nathan-fillion/