The Spring 2011 issue of The National Information Standards Organization (Vol 23, Issue 2) features a number of interesting and worthwhile articles on the future of ebook and ereaders, but none of them are as insightful as a look into the ePub3 format and what the format has to offer ebook readers in the near future! If you're interested in the future of the ePub format and up for a more of a technical read, it's definitely worth a glance.
EPUB 3: Not Your Father's EPUB (PDF)
If you're interested in the other articles they can all be found in PDF format here. The ToC straight from the website is available after the break: