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on colours: as the tech we are discussing here is called e-ink or paper...
I wouldn't even expect an intensity of colours which only displays can offer, because they emit the colours as an active lightsource and that's why I think that any comparison with tablets, iCrap or whatever is out of technical limits. For me the main idea behind this tech was and is imitation of paper insofar that it doesn't consume additional power when not needed (page redraw) and doesn't interfere with external lights just like the classical book page.
OTOH If one could improve the quality of colours or achieve readability in darkness by utilizing a chemical process (use the charge needed for building the new page to make the pixels emit light like chemical lightsticks...
on the USB connection... as those devices are usually NOT in need to transfer hundreds of gigabytes or more of data I perfectly do understand them not being equipped with connectors and controllers to do it. As for the host devices not being able to serve them... well that literally is a problem on the other side and not the readers tech to be blamed for.
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