Hi fabienne,
the official MuPDF web page has a change log. Here you can find it:
http://www.mupdf.com/news
However there is no dedicated version for pocketbook. Did you find anywhere a version of the MuPDF V.1.3 for pocketbook? If so, where can I download it?
What I assume is, that we have to wait until melihron is willing to present us here such a pocketbook porting.
Hey melihron, you are invited to do so.
max.