No special suffix for iPhone 5 (4'' display), just the specific Default-568h@2x.png file.
Here's a macro to handle it:
// iPhone 5 support
#define ASSET_BY_SCREEN_HEIGHT(regular, longScreen) (([[UIScreen mainScreen] bounds].size.height <= 480.0) ? regular : longScreen)
Usage: (assets names - image.png, image@2x.png, image-568h@2x.png)
myImage = [UIImage imageNamed:ASSET_BY_SCREEN_HEIGHT(@"image",@"image-568h")];
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