Before the iPhone 6 and iPhone 6 Plus were announced, there were various rumors that both devices would come with a sapphire display.
Neither device features a sapphire display, the only device which will come with one is the new Apple Watch, there were reports that Apple had to cancel plans to use the glass in the iPhone 6 at the last minute.
According to a recent report from Time, Apple had never planned to use sapphire glass in the display of the new iPhone 6 handsets, and apparently Apple have not decided as yet on whether future iPhones will get the dispay.
Also, anyone who knows the manufacturing process knows that to make tens of millions of screens for an iPhone launch, the orders for those screens had to be put in place well over six months ago and planned meticulously into the final manufacturing of these new smartphones.
The rumors started when Apple made a large investment in GT Advanced, who are producing sapphire glass display for Apple, but these will be used in the new Apple iWatch.
Of course this does not mean that we will not see an iPhone with a sapphire glass display in the future, who knows, maybe next years iPhone 7 will feature the display.