Sources really close to Apple’s contract suppliers, Foxconn, state that in commemoration of Apple’s 10th year anniversary of the iPhone come 2017, there would be major changes in the design language of the iPhones. It is believed that we would likely witness an ALL-GLASS iPhone with metal edge casing.
The said glass covering may likely come from Corning (Corning Gorilla Glass 5 or 6 maybe?), which will see its “famous” physical home button now embedded under the glass screen and function by pure touch. It’s also believed that Samsung would be providing Super AMOLED screens for these new iPhones.