Hi @Robin, just to harp on what you already know. It could all get messy with splashscreens and icons sometimes, have had issues with android way back too. I do hope you know you need a plugin ($ cordova plugin add org.apache.cordova.splashscreen) for splashscreens now and then to configure for iOS: http://docs.phonegap.com/en/3.4.0/config_ref_images.md.html#Icons%20and%20Splash%20Screens
To specify the icons and splash screens in the file system without using XCode, copy the icons into the …/platforms/ios/YourApp/Resources/icons folder and splash screens into the …/platforms/ios/YourApp/Resources/splash folder.
OR just follow this nice post by Holly Schinsky about the topic - http://devgirl.org/2013/09/12/phonegap-icons-and-splash-screens-help/
I hope this helps to clear up issues for you a little!