Apple has sent out notifications to iOS developers that future updates to apps now require higher-resolution, 960x640 (Retina Display) compatible screenshots or the apps will not be approved. The change is a minor one (previous guidelines suggested, but did not require, Retina Display-level screenshots) and reflects the company's burgeoning base of iPhone 4, iPhone 4S and fourth-generation iPod Touch users, all of whom have higher-resolution screens.
