How the reader handles comics:
http://hightech.afmag.net/reading-ma...ve-review.html
As for the questions...
I think that within 2 years, a lowcolour (16 bits?) device will be available. But for what price and what resolution?
As for reading comics... without the colors, I don't feel any reader is good enough. Comics relies heavily on colors, so... if you read them black and white, it'd be like an insult.
Manga and colors isn't a problem of course.