I wouldn't be surprised if a Halo movie does hit theatres in the future. The "Landfall" video that was released on Xbox live awhile back is definite evidence that a Halo movie could be possible and would look really good as well. As for Peter Jackson, all I heard about him was a movie-esque game called Halo: Chronicles, but I don't know too much about that or even if it's in production. I would expect it to be a trilogy mainly so it can get as close to the games as possible, but sometime a few years in the future they should start production on it if they plan on making one imo.