HTML 5, Microformats and Testing Accessibility

Testing is vital, particularly at the border of accessibility theory and practice. I wonder, for example, if tabindex and accesskey would have made it to the HTML4 spec if there had been full testing with assistive technology users? What I really want to know from the HTML5 people is who they think is going to do this research that will provide the evidence that their gang requires before useful attributes are restored to the specification.

Lawson, Bruce. BruceLawson.co.uk (2009). Articles>Web Design>Accessibility>HTML5