I don't think I heard anything of substance in this discussion. Gwen seemed dubious about the Dunc, with good reason. The Dunc speaks poorly, sounds like a marketer, and has clearly never been in a classroom. I heard nothing specific come from his mouth; he has nothing really.
His love for "formative assessments" is intriguing. Formative assessments are basically pop quizzes. Teachers use formative assessment constantly: spelling tests, pop quizzes, writing assignments, all the things kids dread and have dreaded for a hundred years. It's not new. Nothing the Dunc says is new. It's packaging and it's Sputnik, all over again.