Because I really do not want to buy a xbox one. I have a dream where I one day can play all the Halo games, from Reach, CE, 2, ODST, back to 2, 3, 4, 5 and finally 6. Last console I bought was the Xbox 360 and it's fried. I have yet to play Halo 4 :S
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The chances are nonexistent. It's a game that pushes consoles, they'd make significantly less if it was on a platform they don't control completely.