[url]http://www.examiner.com/article/halo-4-limited-edition-content-images-are-released[/url]
From the picture it looks like Halo 4 will come on two discs. Probably one for campaign and another for multiplayer.
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Halo 3 Legendary had two discs, one with DVD content, the other with the game itself. I expect the same. Why would they jam HD video onto a Campaign/Multiplayer Disc? Seems illogical to me.