From what i see so far, I have the impression that the company behind kobo is not that interested in supporting pdf/djvu very well, since pdf/djvu you get for free, and that's why I guess the prefer to concentrated their work/attention to the people who are buying epub books.
There I'm not so sure, if I should start investing time into development for kobo, since the software by sony as superior, and it looks like they could bring a great device on market in the next time,
watch that prototype
https://www.youtube.com/watch?featur...&v=bvJuLK65dio