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I am not so much worried they add JavaScript and videos to ePubs. What I am worried is that my download time will be longer. With 3G or WiFi ereaders, it does have huge difference whether size is 500kB or +100MB.
JavaScript support could be useful for navigating or for notes. It could be useful for school books or similar self-teaching books. JavaScript can have other possibilities, too. But not on standard eInk device which started the whole ebook frenzy. Will current eInk devices support ePub3 through firmware updates, I guess not.
I have take closer look on what ePub3 has to offer, other than bells and whistles. Inserting video seems to be easy at least. Standard HTML5.
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