I think the next big form factor will still be the iPhone in terms of size but (and I've seen a few videos that also show this) the "growth" will be in sensors that and projector type mechanisms. A small Kinect type sensor on one side that can detect what you do with your virtual keyboard. The onscreen keyboard is still available for use as well when not using this configuration. Likewise the screen can be on the phone, projected onto a surface or can connect wirelessly via other screens only, unlike now, the touch screen is still available for use when the other screen forms are being used. Thus you can set your phone down in front of a monitor and it will wirelessly send information to it while your phone becomes your "mouse" and projects or allows you to connect a keyboard wirelessly as an example.
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