CORRECTION - NO Ron Clark on the video, only Arne. A major disappointment. Arne was good, but Ron stole the show. I hope NCTM will post it. In the meantime you can check out the video that he showed at the outset of his talk at his website (http://www.ronclarkacademy.com). Once the main page comes up, click on the image that "Watch Now" points to (like in the image below.)
See also Scott Steketee's review of Arnie's half hour presentation.