They don't charge until it is shipped.
I got this response from Amazon yesterday:
Our latest information indicates that "Sony DVPNS75H Single Disc DVD
Player" has not yet been released and the expected release date is
not known. As soon as a release date has been determined for this
item, we will add that information to our web site.
While we are confident that copies will be made available, we cannot
provide more precise information about the fulfillment of the order.
In light of this uncertainty, we will understand if you would prefer
to cancel your order. As of yet we have made no changes.
However, we have no new information at this time regarding the status
of your order; you will be notified as soon as there is an update.