I don't see the fuss, what does html5 really mean anyway, a bunch of stuff that was already in development was put under this umbrella term because it was easier to market.
Microsoft being a company that want to make profits have taken this one step further with running native html5 apps, it might not mean anything to a technical person but it is a good marketing pitch. They are successful because they are good at this kind of stuff and it is why some people still think the IE symbol is the internet.
HTML5 means nothing on its own. It is just fluff, a keyword for marketing people to use to look new, hip and buzzword compliant.
It is like AJAX which refers (incorrectly) to techniques that had been in use for ages before the term was coined, and the many names being given to old techniques for dynamically loading Javascript and/or breaking the same-site barrier in order to make them sound new and fresh (rather than just rediscovered now they are more generally relevant as browser use and capabilities have evolved).
HTML5 and AJAX are terms I used to judge people (yeah, I'm petty like this). If someone mentions HTML5 (without more specific about what they mean) or AJAX I just assume they don't quite know what they are talking about until they have proven otherwise...
Microsoft being a company that want to make profits have taken this one step further with running native html5 apps, it might not mean anything to a technical person but it is a good marketing pitch. They are successful because they are good at this kind of stuff and it is why some people still think the IE symbol is the internet.