This new standard will hopefully become default within the next two or three years, but that doesn’t mean the adventurous of us can’t start playing early. That’s exactly what I’ve been doing, and even with the exciting potential of smarter Web apps, games and complex animations, my absolute favorite thing about HTML5 isn’t complicated at all — that’s the point. HTML5 makes more sense than any other iteration of HTML, which makes it significantly easier for newcomers to grasp and way less annoying to use.
Of course, most of you will know that HTML5 isn’t news at all — its development has been entirely public from the beginning. Still, as we near its standardization, it’s worth watching closely (like heavy breathing behind your ear closely).
Source : http://thenextweb.com/dd/2012/06/28/im-really-really-excited-about-the-new-html5-tags/