Html5 for iOS game development

Hi all,
I have been hearing of the advent of html5 for iOS development. I know nothing about web dev technologies and am wondering, can this really be used for iOS game development? Just hearing html makes me think this will be used for web related apps, not things like graphically dynamic 2d games, but being unfamiliar, I’m hoping to get some insight from the experts here. Is html5 going to be useful at all for games, or should I basically expect to be sticking with the likes of cocos2d for iphone?