Can I dump my non-Retina Images for a iOS7 only app?

Question

The next update of my iPhone app will be targeted for iOS7 only. A couple of questions?

Does this mean I can delete all the non-retina images from my app?

If

Answer 1

Yes you still need to have the @2x at the end. Yes you can drop all the non-retina images but could affect performance as even the newer devices will use some none-retina images but the main performance hit was to iPhone 3GS and below but as iOS 7 will not run on iPhone 3GS or below it isn't a requirement you'll just have to handle the performance issues. No Apple do not keep hold of older versions of your app on the app store, if you drop support for it then it is gone.