hey I just want to chime in here and point out a possible (temporary) solution, without needing to manually dive in and edit the .app file.
We need to add 3 new icon files (2 required, 1 recommended) + equivalent build.settings entries, and then an extra table in build.setting for launch images
Please see my other post here:
http://forums.coronalabs.com/topic/51066-screenshots-and-new-iphone-size-compatibility/?p=266436
I tested it and it worked on my iOS 8 devices (launch images picked up by iPod Touch 5th Gen & iPad 2 @iOS8), however I don’t have iPhone 6/6+ to confirm this and call it a 100%… but I hope this would help band-aid the situation right now.
As long as the launch images are getting picked up by the OS, then the app should not scale on the new iPhones… so at least our Corona built apps can utilize their native resolutions at this point; and possibly passing the App Store screenings / warning messages.