Think about it.... The Betas probably run the same amount of time. (Maybe 2-3 weeks?) They get early access. Which also means that their beta will end earlier than ours. So, while they can brag about getting early access, we can brag about it after their beta ends.
Of course, this is all speculation. If the Xbox beta is shorter than the PS beta, you can consider my pre-order cancelled.
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I also believe they will get extra time, unfortunately for us X1/360 players. What I find strange is once upon a time beta's were to test a game, not provide and incentive to choose one platform over the other. Oh how times have changed...