content: "ionic wind" or ionic propulsion of flying vehicles has been around since at least the 50's. The big problem is the massive power consumption. Most of them require an external power source to fly (ie a long power cord). They're easy to build, you could make one yourself at home. I'd guess recent developments in battery technology and lighter high voltage power supplies have made this prototype possible. But the thrust output from these kinds of engines are incredibly weak, it's unlikely they'll ever lift anything as heavy as a human (unless they're massive like an airship). Its a cool technology, but don't hold your breath for flying saucers any time soon.