As good as this is, it doesn't seem too much of a quantam leap from where Google Translate is, with conversation mode, installable in every Android phone.

I didn't hear the inflections in his voice superimposed on the Chinese voice, so it is just modeling his voice characteristics and reflecting that into output voice. From what I understand the voice modeling happened off line, not in real time, so it is not nearly as sexy as if it was happening as he spoke. In other words, a nice touch, but I don't see it as revolutionary (unless I'm missing something).