The Bindings panel is created by adobe.
As an extension of Dreamweaver, we use the Bindings panel that Adobe has developed. whether or not you have WebAssist extensions installed, the bindings panel will not show HTML 5 element types. It is not a case of the Extension needing to be updated. It is the Adobe bindings panel in Dreamweaver that needs to be updated.
Data Assist uses a jquery HTML5 validate script to add validation. the advantage to using the HTML5 validation script is that it allows you to use standard HTML4 element types, and apply HTML5 validation to them that will will be supported in older browsers that don't have HTML5 support.