The decision of suddenly removing support for localized launch images, especially since the distinction between iPhone5 support is done by checking whether a launch image of a certain name exists, is really, really strange. It breaks all existing apps that have localized the Default-568h launch image: Suddenly all such existing apps are launching in iPhone4 mode (and, depending on how they detect the screen size, may become badly clipped).
These apps suddenly showing just a black screen at launch instead of their usual launch image is a minor cosmetic problem. They suddenly starting in iPhone4 mode (while still possibly thinking that they are running in iPhone5 mode) is a major breakage of these existing apps.
Yes, this happened to us, without any warning. Our existing app on the AppStore suddenly broke this way when running it on iOS9.