When I pre ordered digital it told me that I would be charged no sooner than 10 days before release. 
That's after gameplay reveal and beta, plenty of time to cancel the order.
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	Odd. When I went to pre-order Rise of Iron on PSN, I had to pay up front. Think it's a recent change to the system though.
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	I don't know man, either Xbox is different or different rules apply to a dlc than to a title release. Those are the only things I can think of
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	When I pre-ordered Mass Effect in February I had to pay up front as well. Didn't mind though, game was totally worth it.