Hi all,
ePub is an open and a more and more widespread format because it assures an excellent reading experience on medium and small size terminals (tablet, mobile phones and ebook readers, of course).
There are several LibreOffice extensions/plug-ins to export to ePub. I think it is the time to offer this feature natively in libreoffice, very much like it is for pdf export/import.
regards,
dommac