According to Best Buy policy, when you place your pre-order they’ll authorize your form of payment with your bank, which results in a temporary authorization hold. After a few business days, the hold should be automatically released and the funds returned to your account. Shortly before release day as your order begins final processing for shipment or store pickup, they’ll reauthorize your form of payment, resulting in another hold. Once your order ships or becomes ready for store pickup they’ll then collect payment.
Please note that pre-orders placed using PayPal are processed differently, and are charged immediately upon placing your pre-order.