I'm skeptical. Am I the only one that noticed what appeared to be the plethora of CGI in the video?
If this is an attempt at viral marketing, it's worth remembering how many people got pissed at the shoe company that commissioned the Liquid Mountaineering ad - Hi-Tec I think it was.
Edit: If you watch his previous video, at 1:53 here you can clearly see the leaves changing as it blurs and cuts to another shot. http://www.youtube.com/watch?v=Q0tKFOcHyrI&t=1m50s Debating this is a waste of time, it's another hoax.
That was clearly a platform just under the surface of the water. The actual footage was genuine, they just weren't doing what they claimed to be doing, whereas this certainly looks to be a total fake job.
Stage magic vs cut-rate Michael Bay
It's oh so convenient that the cameraman "happens" to look down and the camera happens to blur (what is it refocusing on?) between the time when the wings are resting on the ground and when they are picked up and ready for the test flight. Then the camera is conveniently moving and keeping things just a tad blurry while the wings start up. If you compare the appearance of the wings before and after the cut you'll notice some slight differences.
You tell me, does this look real or fake? http://i.imgur.com/YtPMI.png
From the video it is also obvious that there is no way someone could have stuck that there in the time it took for the camera to turn away and back again.
They really do act just like that. The camera person stops to video and everybody runs in front of him. The camera person needs to change position quickly so you tape the grass whirling for a few seconds.