Well, it´s not working with Google Chrome or any browsers.
Oops, i'm retarded, on iOS 5 it´s the old app of course. So the question is still here on iOS6. And since there are some jailbreak tweaks to force Safari to open new YT app, it's seems new, no?
Edit: According to some Website it´s a special treatment for Google... As expected. I'm an indy dev, and i would love to launch my app with a regular http link.