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

I have also found the apple link for this problem. Under heading 'Supporting New Screen Sizes and Scales'. You can check out above link for more such information.