Good point - we'll release a new version soon with the correct spelling and a deprecation for the old one.
We wanted to highlight that this feature should be used very carefully. The html string you pass in is technically allowed to have bindings, however, those bindings are not visible to the polymer transformers, and that could make your app fail after we built it (even if it works initially in Dartium).
To make sure that your app works, you'll need to help the polymer transformers figure out what to do. For example, you could add the same bindings somewhere else in a template of a custom element, or define a @ComputedProperty using the binding expression in it. This is similar to the problems that come up if you add nodes and bindings dynamically in the shadow of a polymer element (see
http://stackoverflow.com/questions/24203830, for example).