.....spoiling. Just like every other movie, it will have a premier a month or 2 before the movie is released,and then that one scum bag will leak it ALL OVER the internet. I don't think the average Floodian can go without Bungie for more than a month.
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add to that Films based off of Video Games do not have a good track record at all, personally I would hate a Halo movie and not every fan would be satisfied either