Not so Heavy Metal
As Apple has purchased worldwide exclusive rights to use materials developed by LiquidMetal they may decide not to go down the carbon fiber route and substitute carbon fiber with metal. At the very end of the patent application it says:
The foregoing has been generally described with respect to particular embodiments and methods of manufacture. It will be apparent to those of ordinary skill in the art that certain modifications may be made without departing from the spirit or scope of this disclosure. For example, a fiber other than carbon may be used as a strengthening or stiffening element. As one example, certain metals may be used instead, or another type of plastic may be used. Accordingly, the proper scope of this disclosure is set forth in the following claims.
Still, if you want to see some seriously strong and thin carbon fiber then have a look at this http://www.stylepark.com/en/established-und-sons/surface-table