Oversize iPhones and leaked memos.

Apple and AT&T stores nationwide are getting ready for the launch of the iPhone 3G on Friday. As posted on Gizmodo, a picture of an oversized iPhone 3G shows what will be available for gawking at later today in your local Apple Store.

AT&T stores are due to get the iPhone 3G demo units starting tomorrow:

“Beginning July 8th you will receive the new iPhone 3G demo devices at your store to enhance your sales process. These devices will be used the same as your 2G demo devices in your sales process but now you can demonstrate the additional capabilities of the iPhone 3G including the App Store”

The leaked sales memo details that employees are to download apps from the iTunes App Store. While the demo units will be in the stores tomorrow, they may not be for public use until July 11.