Some pictures of inkBook Obsidian in a Polish language review, including a comparison picture of the frontlight of inkBook Obsidian and the older inkBook Onyx.
http://swiatczytnikow.pl/czytnik-ink...rwsze-wrazenia
Obsidian has a warmer color (+) but also some shadows at the top that were not present in Onyx (-). It is not only in the picture - the reviewer says so.
For me, it is only important if the frontlight can be turned off completely
Anyway, it shows that there are more differences between the two models, not only the capacity of the battery.
Some details are better visible here:
http://www.dobreprogramy.pl/inkBOOK-...Lab,67567.html