EPUB 3 Is Here
The EPUB format is an open standard for ebooks. The third revision has just been voted in.
Stakeholders that have expressed interest in EPUB 3 include Adobe, Google, Ingram, Kobo, OverDrive, Random House, and Sony. Others are listed in this article.
So, we may be seeing ebooks that include more functionality than just text or reading the text. This could change the definition of “book.”