i think the reason for showing off so many html apps is to hammer home the point that html+js is an equall player amoing the development models. i think the point is that you're supposed to be able what ever platform you perfer and it will work well in win8

so i dont think its about a perferred platform at all. if they'd not shown html apps, people would blame them of not going all in on their own platform

microsoft wont be modifying javascript as such, they'll just expose another js object next to the dom that will expose winRT services. i very much doubt that they'll even try to standardize that though.. html+js apps written for win8 will be just that, apps for win8.. they wont really work in the browser [im pretty sure anyway]