Yeah, I also doubt that the 6" model was a success. But that has not stopped PocketBook before. (They also had two color readers with e-inks previous triton displays.)
While 7,8" is an improvement, it still does not feel like enough. For comics you want at least 10", especially with e-ink since scrooling and zooming would be a pain.
Also the resolution seems to stay the same (300ppi for books, 100ppi for comics).
I still don't see people getting this as a dedicated comic-reader, unfortunately.