[url]http://halo.xbox.com/blogs/Headlines/post/2012/05/16/The-Halo-Bulletin-51612.aspx[/url]
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The only thing that worries me is that you're paying for the map packs before playing the game and even before they come out, therefore you cannot judge whether or not you want the map packs. I'll probably wait till' E3 to make my decision.