Difference is it makes sense, because a handheld computer can never be a good camera, and me and enough other people said it.
Hack it yourself. Maybe there are unused pairs on the screen cable, if they are broken out i both places it should be fairly trivial.
You run into the problem that one camera doesn't solve, (unless it rotates, or has a periscope, both of which add another level of potential fail-prone complexity); front facing, or backward.
And fairly soon you will probably consider stereoscopic cameras essential, in both directions.
What i don't see happening is that doing the job of a camera.
The same goes with a projector. Some things are just infeasible due to physical limitations of light and optics.
Speakers is a prime example, because of thiele-small parameters but always requiring headphones (which are not included), or external rig (for what is a portable device) was seen as enough of a reason to include them.
I do carry headphones and a camera, a pandora, and a laptop if i want to type anything.
At home i have a real keyboard, real screens, real microphone, additional headhpones, etc, and real mouse.
It even goes to trackball and digitizing tablet.
If the pyra keyboard is better a lot of things would be easier. A comparable usbcam/solution is small.