I too thought of this as it could also mean that you wouldn't need an ugly/dangerous power cable to power a tablet (for risk of it being pulled off the wall and the micro USB connector being broken).
I haven't looked into it at all but I am thinking that if an ebook reader could be loaded with Android, then you'd simply be able to use HABDroid. The thing would be to use the radio sparingly in order to not consume too much power, so HABDroid would need to get a setting to set its update frequency (no big deal if it doesn't update right away should you change something on its display elsewhere). Every 5 minutes or so, with WiFi shutdown, ought to save a good amount of power all the while showing somewhat up-to-date system data.
The other thing is that Android would benefit from some updates for use on e-paper screens in order to avoid scrolling and animations and such. There is a phone out now with a backside e-paper display, so I think that people are working on this in order to minimize the screen refreshes (time and energy).
Cheers,
Greg