The phone will be carbon fiber. This plastic case the phone will go in will obviously have a clear cover on it to show off the color phone. It will be just plastic.
Here's another thought on the material of the phone itself... iPhone 5CF looks like a stupid name, but iPhone 5C makes sense and will have multiple purposes... 1 - for indicating color, 2 - for indicating carbon fiber.
Here's something to think about:
Kevin Kenney - Senior Composites Engineer - Worked at Kestrel Bicycles and was credited with being a pioneer in carbon fiber bicycle frame design. He was hired by Apple just last year.
Apple has been exploring a different shell material and design for years. Sure, the reports indicate MacBooks, but why stop there:
https://www.macrumors.com/2009/04/3...iber-composite-materials-for-exterior-shells/
The phone could be Liquidmetal with a color coating:
https://www.macrumors.com/2010/08/0...quidmetal-technologies-advanced-metal-alloys/
After all, here are some characteristic properties of LiquidMetal:
- High Yield Strength
- High Hardness
- Superior Strength/Weight Ratio
- Superior Elastic Limit
- High Corrosion Resistance
- High Wear-Resistance
- Unique Acoustical Properties