Dozens, and soon to be thousands, of iPhone 4 preorder customers have been receiving emails from Apple notifying them their iPhone 4 will be shipped one day early on June 23^rd.  The full email from Apple is posted below, if you’re interested.

Dear Apple Store Customer,

You recently received a Shipment Notification email from Apple advising you that your iPhone has shipped.

This email is to confirm that your delivery will occur on June 23rd. Although Apple and FedEx tracking information may currently indicate a later date, you can check the FedEx website the morning of the June 23rd to track your package to your doorstep.

In the event that you will not be available to accept delivery on June 23rd, it may be more convenient to use our pre-sign delivery option by visiting our Order Status website at http://www.apple.com/orderstatus

Sincerely,

The Apple Store Team

[via Engadget]