Following the digital edition of the English version of Start-Up (Kindle, iPad) last summer, I just did the same for the French version. More details on the page which lists all published versions in paper (English, French, Russian and maybe Italian soon) as well as digital ones.
I was wrong about the difficulty in producing an iBook for Apple. Thanks to an EPFL colleague, I learnt I did not have to use complex editors such as Calibre (and then do a lot of manual corrections). I just imported my Word file into Pages eand then converted it in the ePub format. It then took Apple 8 days to validate the content.