Man...Imagine Spielberg and Jackson Producing...With Neill Behind the Directors chair. PURE GOLD! Although I know Neill's stand on a Halo Film.
Now about that whole "Fall of Reach" Im not really for. Don't get me wrong its a great read. But I'd rather see the adaptations of Halo Combat Evolved, Halo 2, Halo 3...
For example Alex Garland's "Halo" Script tell the story a bit of "Fall of Reach" in the beginning of the film. While Chief Is dreaming or something. I'd go with Garlands Script. But Spielberg would be a good choice to produce it. I know for a fact the film would be visually wow...but can the story hold the same ground as the effects...thats a different story.