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The question no one has answered for me, is why? Why should I waste countless hours of my life adding support for epub 3 to calibre? What does epub 3 enable that epub 2 does not? Just because some committee has declared a new "standard" does not mean that standard is automatically a good thing and must be adopted by everyone.
I have yet to see a use case that I care about that is possible with epub 3 but impossible with epub 2. As such I have far more important things to spend my calibre development time on.
Furthermore, since epub 3 is not backward compatible with epub 2 generating epub 3 files will mean your books will not work properly on large numbers of existing installations. UNless you restrict yourself to things that could be done in epub 2 anyway, in which case what is the point.
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