Apple is now prompting developers to submit taller screenshots alongside any app submissions that support the new iPhone or iPod.
If you are updating your app for iPhone 5 and iPod touch (5th generation), you must provide additional screenshots to support the new screen dimensions for the App Store.
The new screenshot dimensions are:
● 640 x 1136 (portrait)
● 640 x 1096 (portrait)
● 1136 x 640 (landscape)
● 1136 x 600 (landscape)
Developers can add the new screenshots by going to the Version Details page in the Manage Your Applications module on iTunes Connect.