Apparently, only damaged iPhone 5s, iPhone 6, and iPhone 6 Plus units will be accepted.
Apple believes that this new program will encourage new iPhone upgrades versus a standard iPhone screen repair.
Apple Store employees will use a protector installation machine that can ensure a good fit with minimal air bubbles.
If something does go wrong, Apple will offer a free screen protector replacement and re-attempt the installation.
source: www.techworm.net