Hi
6 year ago I did a free fall from 13,000 ft and was chatting with the instructors about the wing flying thing the guy who invited it is had died a while before the chat but his record was to travel 120km across the ground. I cannot remember if it was out of a plane or a base jump but he was at that time the only person who was able to keep the wings in place long enough so I suspect this is a group who are taking up where he left of.
fascinating stuff though imagine you can't close your legs or arms or you fall out of the sky.
I should say the guy who developed it was so good he landed without the parachute he lifted very close to the ground and just landed on his feet. I wish I could remember his name.
Got to say not for me though no way! jumped and did my thing but this doesn't do it for me.