Cupertino has just been awarded a patent for a manufacturing method that can fuse glass structures together while containing all the internal circuitry.
Importantly, the proposed design will be durable (no more cracks, hopefully) and lightweight - as well as being obviously nicer to look at.
In fact, the only downside we can see to an all-glass iPhone is that we might be prone to losing it.
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Jonathan Ive is listed as one of the inventors of the technology, and with sapphire glass (probably) tough enough for the challenge, there's a very real chance that Apple might see a promising future in glass.
Via Apple Insider