Ok, but it's just the same things that we could do for some years with Flash. What will change? Before was Flash, now is HTML5? So, what? Just technology? Many users does not notice even what technology you are using
What will change? Maybe nothing, but it's definitely interesting work. One could, for instance, use this as the endpoint of a SIP PBX without serious effort, which is not the case for a Flash endpoint.
More like non-standardized parts which currently are working drafts only.
But seeing how just saying "this is standard HTML, really!" again and again and again worked for the What WG, I guess there is nothing wrong in browser-vendors attempting to do the same to get their proprietary extensions embedded into the standard as well. At least it's not much worse.
All is good in browser-wars and love, etc.