See article on 9to5Mac:
App Store apps that access UDIDs, don’t support iPhone 5/Retina to be rejected May 1
Basically, access to the UDID has been turned off in Corona SDK, so that may not be an issue going forward for us, but if your app does not support widescreen displays or Retina Displays, it will be rejected by Apple starting May 1, 2013.
Get your submissions in soon, and then you can provide an update, or if you want to make a bigger splash from the start, make sure you have the most devices supported with your version 1.0.