How the apps already build for iPhone 4 and 5 will shown in iPhone 6 and 6 plus

Question

As the apple has announced the two more screen sizes iPhone 6 and 6 plus. What will happen to apps already in app store build for iPhone 4 and 5. Will they be stretched or t

Answer 1

As Bhumit said, you need to add launch images at the new sizes if you want to have your apps scale properly for iPhone 6.

A corollary is that they will not scale in the simulator until you add those launch images. You can just add some default ones to test - I recommend grabbing David Smith's blanks.

If you do not test in the simulator with launch images, you will get a false impression of your app working because the default scaling kicks in. (If you are happy to leave it with that default scaling, fine for now.)