What actually makes it an HTML5 Library vs just another framework? I saw there are some libraries included for websockets, anything else?
The template language uses and promotes the new HTML5 doctype and semantic tags. It also makes a heavy use of the data-* attributes which allow features previously available only in declarative XML formats. WebSockets are optional but there is support available out of the box. And this is just the beginning...
Are there docs?
As of now, there aren't (m)any docs.
They have provided a quickstart guide on the site though.