And for the rest of us
Not sure what the kernel/hardware implications are, but it would be nice to be able to replace the back cover of an existing phone for one with one of these displays in it. I'd happily sacrifice 3mm (or whatever) thickness for a 2nd display.
There could be options such as replacement covers for the popular phones and stick-on screens for everyone else.
Communication would have to be via BT, USB (if phone supports host).