[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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[quote][b]Posted by:[/b] Stoneenergy Well, if it's going to be like the OP said, at least I don't have to switch discs constantly like I have to in Mass Effect. [/quote] You just have to download ~8 GB of multiplayer from second disc, that's all. Then you should able to play on one disc so far. :)