Originally Posted by Jellby
ePub 3 has some advantages for "normal" books too, like HTML5 syntax (potentially simpler than XHTML), support for additional CSS properties (like text-transform), possible inline TOC (replacing NCX)...
If I had a well-behaved ePub 3 reader, I'd be creating ePub 3 books already.
I doubt HTML5 is simpler then XHTML. Also, the ePub3 ToC is more difficult then the NCX ToC. Overall, ePub3 (IMHO) ePub3 is not easier then ePub. Plus, there are not many tools to help with ePub3. And given that there are no real readers for ePub3, making eBooks now in ePub3 is a total waste of time and effort as nobody will be reading them.