1. The problem with e-ink still small for technical book have 2 reasons: bed reflow+zooming and missed landscape mode. 'cos of second one I can read book on 6inch ereader which looks bigger than on EE 10inch. The reason -- lhorisontal mode on 6inch vs vertical mode on EE. Most technical books were optimised for horisontal displays.

2. Afraid that camera in EE is just a marketing trick: "$500 seems expensive.., hey but there's a cam, and it's only $499 ". The cost of the cam like this is less than $5 with installation in to device. EE must used swirl cams with good optic and chip, but thay cost more than $15...

3. As for general, I was wery frustrated by sofware part of the EE (i tald about this in eDGe potencial thread). But probably I can rewrite needed software by myself especially if source codes will be published.