From my email confirmation:

**If I preordered, when will I be charged?
**Credit/Debit Card: If you paid by credit/debit card our store system performed a preauthorization on your credit card when you placed your order. While this doesn't post a charge to your account, it does reserve the funds from your available balance right away. Your credit card company considers this to be a "pending authorization". The actual charge will officially post to your account after your order ships for physical versions, and when your download information is sent for download versions.

Paypal: If you paid by Paypal, the funds were immediately transferred to e frontier when you sent payment from your Paypal account.

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