For me this serie have been a big change ! Those are the first epub3 I made. Until now it was epub2.
So, what does it change ? Well... apparently nothing.... Yay \o/
Actually it does have some cools new features apparently, I have yet to check them all. But one of the interesting one is the support of a serie metadata. It means that if the reader is able to use it, the whole serie will be classified under the same serie, a little like in Calibre ! Problem, Calibre doesn't support this tag yet too. sigh
So, maybe, I hope, in the future, possibly, later this could bring some new cool features, but seems like not yet. For now I'll start to find what cool things I can do too with epub3 without dropping the compatibility.
Before I forget, thank you for those translators, and actually a REALLY good chunk have been translated by Code-Zero. At a point we could probably say he did the translation.