You are correct that he was using an earlier version of the Photosynth viewer. It is, in fact, the same interface from the Photosynth Community Tech Preview (you may see it called the Photosynth CTP).
Before we could upload our own photos and make our own synths, everyone who installed the Photosynth viewer used that same interface to preview the five synths that the Photosynth team had put online. It had the button to view the cameras' frusta, another button which has since been removed for taking a circular aerial tour of the pointcloud, when switching to 2D mode, it always put the last photo that you touched in 3D mode in the middle and grouped the photos around it in a spiral based on how closely related they were to the current photo, and every time you opened a synth, it had a cool animation.
Here's a screenshot: http://en.wikipedia.org/wiki/File:Photosynth.jpg