Xb360 game leaks aren't uncommon. If i looked around I could probably find at least 10 other (high profile) titles that were downloadable before the official release date.
At the top of my head, i'm pretty sure it happened to Mass Effect 2 and Assassin's Creed 2.
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Fakes here will get you banned. Besides, none of the 150+ comments indicate that it's fake.
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