Same iPhone 6s and iPhone 6s Plus Display Sizes
In 2014 Apple finally delivered a major jump in iPhone screen size that many users wanted. This is likely part of the reason that iPhone 6 sales are still strong.
Every year there is speculation that Apple will change the screen size and resolution, even with an "s" release.
Kuo suggests that the iPhone 6s display and iPhone 6s Plus display will remain at 4.7-inches and 5.5-inches respectfully.