I don't know how this is html5. The only element of html5 being used is 'canvas'. 99% of this is javascript.
html5 won't be out for the masses for a while yet as they're still working on the spec although browsers have already started implementing aspects.
html5 is still a work in progress with some elements like 'details' getting removed recently and they've also removed 'canvas' from the spec and are turning it into its own spec, so widespread usage of that will be longer than html5.
On another note, Vimeo and Youtube have implemented the 'video' element and it looks and acts pretty slick, but just wait until the patent holders for the h.264 video format to ask for their dollah dollah billzzz. Could derail the whole video aspect of html unless the working group can convince the browsers to adopt the ogg open source format.