The future is all HD and Apple wants all the Apps to be HD. Today Apple told developers that Retina Display screenshots are now a Requirement for iPhone & iPod Touch Apps. Apple is the only company that uses Retina Display, Retina was introduced on the iPhone 4 & it looks like it will stay at Apple’s new iDevices. It is widely rumored that Apple’s upcoming iPad 3 will be packing a Retina Display. Below is the note Apple sent to the 3rd party developers.

 Required iPhone & iPod touch Screenshot Upgrade for Retina Display
When you create or update your apps in iTunes Connect, you must upload screenshots that are high-resolution. We require your screenshots as high-resolution images so that your app is optimized for the Retina display.

The requirements for high-resolution images are 960 x 640, 960 x 600, 640 x 960, or 640 x 920 pixels. Images must be at least 72 dpi, in the RGB color space, and the file must be .jpeg, .jpg, .tif, .tiff, or .png. You can update your screenshot files at any time in iTunes Connect.