Executei o seguinte código no iOS 7 e iOS 8:
UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
BOOL landscape = (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight);
NSLog(@"Currently landscape: %@, width: %.2f, height: %.2f",
(landscape ? @"Yes" : @"No"),
[[UIScreen mainScreen] bounds].size.width,
[[UIScreen mainScreen] bounds].size.height);
A seguir, o resultado do iOS 8:
Currently landscape: No, width: 320.00, height: 568.00
Currently landscape: Yes, width: 568.00, height: 320.00
Comparando com o resultado no iOS 7:
Currently landscape: No, width: 320.00, height: 568.00
Currently landscape: Yes, width: 320.00, height: 568.00
Existe alguma documentação especificando essa alteração? Ou é um bug temporário nas APIs do iOS 8?