I'm sure the intent is for sapphire iphone screens. Why else did they build a 700 employee manufacturing facility? A facility just for camera lens, touchID, and Apple Watch "edition" would not need so many people.
I remember reading about shipments being shipped out of the GTAT facility presumably headed towards China. Also, additional labor still needed to be done in China to round off the edges of the sapphire. It was the rounding process which the Chinese contractors were having difficulties with and produced low yields of the finished product. (
See link)
We've all been hearing how hard sapphire is and it is the hardest substance on the mohs scale next to moissanite and diamonds. Now imagine how many diamond dust polishing disc they have to go through to get a smooth surface. With sodium glass it wouldn't be an issue (softer material). Should we be blaming Jony Ive's design for this?
From what I understand, Apple owns the land and the building so they are the landlord. Apple does not own the equipment or technology for producing the sapphire crystal instead Apple have provided a substantial loan to GTAT to finance the equipment and signed an exclusive contract for production at the AZ facility. I believe GTAT is meant to be a just-in-time (JIT) production facility for Apple.
Because Apple has delayed future shipment GTAT is still bound by contract to pay its loan and operational cost. Without cash-flow from its deliveries GTAT is in a bind. This is why they need to file for Chapter 11 protection to get out or delay their obligations to Apple.
Both parties were very optimistic about the sapphire screens and how well it would be accepted in the marketplace, hence the huge outlay of cash by Apple and also its willingness to support the 700 employees of GTAT now.