Thanks to optiongeek for positing the following.
The video of the June 28th demo at Brilliant Light Power has now been posted. It shows a device with a reaction chamber the size of a tea cup capable of producing over 1MW sustained energy output with a power gain of over 100x. The process is measured via bomb calorimetry, among a number of other sophisticated techniques. Mills claims he is on track to producing a fully commercialized device by 1H17.