Well, I don't think the doctype is a useful measure about what a page is. This forum, for instance, is not remotely "HTML5" (doesn't use any new features and is not near conforming), yet uses the short doctype (mostly just to get out of quirks mode).
Anne's blog uses WF2 features yet has an HTML4 doctype. There are lots of
canvas demos that don't use the HTML5 doctype. I'd consider those to be more "HTML5" than a page that uses the HTML5 doctype but no new features...