I've been thinking about this. It'd be cool if they designed one that could be separated from the device(if you only need the virtual keyboard), yet attach to the back via magnets(if you need a physical one).
The keyboard could communicate through bluetooth. And since it is attached with magnets, it could have a really minimalist design and basically take any shape, not compromising the design of the phone, conforming to whatever design the phone has but adding only a little thickness. Also, with internal magnets of varying strength, this keyboard could slide out like on other phones, but not require all the design compromises to achieve the functionality.
The only problem is negating the magnets power over cellular signals. I don't doubt it could be done though.
I think if there is a future keyboard for an iPhone, it'll be like this, or be a larger, still virtual, projected keyboard.
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