Representatives from Apple confirmed on Tuesday that some iPhone 4 pre-order customers will receive their new combination iPod and smartphone on June 23, a day ahead of the official launch.

Per The Mac Observer, the confirmation e-mail Apple sent to some pre-order customers stated “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.”

The official launch date for the iPhone 4 is Thursday, June 24th. Apple will be opening its stores at 7 AM for customers that reserved iPhones after the pre-order program kicked off.

The iPhone 4 offers several improvements over the iPhone 3GS such as a thinner body, a higher resolution multi-touch display, a 5 megapixel camera with LED flash, support for capturing 720p video, a front-facing video call camera, a built-in gyroscope, and more. It is priced at US$199 for the 16GB model and US$299 for the 32GB model.

If you’ve gotten this e-mail on your end, let us know.