I had a similar problem when submitting an update that did not include support for the iPhone 5. I saw a warning in Xcode that said I was missing "Default-568h@2x.png" launch image. When I clicked on the warning in Xcode, I was given an option to add a default launch image and I added the default image. Everything worked fine when I created an archive and validated the file in Xcode, however, I eventually got an email from the iTunes store saying "The status for the following app has changed to Missing Screenshot." After tying several things, I eventually figured out that I could remove the "Default-568h@2x.png" file from my project and resubmit it without the requirement to add the new screenshots for the iPhone 5. I think the presence of the "Default-568h@2x.png" triggers the need to have iPhone 5 screenshots.
To summarize, the problem I had was caused by adding the "Default-568h@2x.png" file to the project without adding screenshots to support the iPhone 5 display. When I removed the .png file, validated and resubmitted my app, I was able to successfully submit my app without the screenshots.
I hope this helps.
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