Check this out:
I don't get that excited about comic book movies anymore, because it's just so hard to get them right. But if this was the actual trailer for the upcoming Green Lantern movie, I'd be in line already.
If nothing else this makes the case that Nathan Fillion would be a perfect Hal Jordan. In reality, they probably won't cast him because of his age. They'll want someone young enough to reprise the role over the next 10 years in potential sequels and a Justice League movie, and its potential sequels. This mindset has overtaken comic movie planning and, I think it's a misguided approach. All that energy should go into making the first film as good as possible, instead of taking success for granted.
Also, the guy who made this, Jaron Pitts, should get a job working on the actual film, or at least a chance to make the real trailer.