It seems that for whatever reason Amazon will not be able to ship the Nikon D7000 on time and they are now offering $25 credit to existing pre-orders - not sure if this discount is valid for all pre-orders or only for those that cannot be shipped on time. This is the email that was sent just few minutes ago:
We're writing to let you know there's been an unexpected delay in shipping your Nikon D7000 Digital SLR Camera.
This camera has proven to have an extraordinary demand and we're shipping orders as quickly as possible. At this time, we're not sure of the exact date your camera will be shipped.
We're very sorry about this, and to make up for the inconvenience, we'd like to offer you a $25 discount. You don’t have to do anything; the discount will be applied to your account when your camera ships.
We look forward to seeing you again soon.
Customer Service Department
It seems that the $25 discount was applied automatically: