Hahaha. Cat's out of the bag. Lots of speculation here. I haven't ridden one of these things but Ken and Sky have been working on them a lot for a while now. Here are some notes from Ken that might address some of the thoughts on here (also worth noting that he thinks Ronnie's comments are really perceptive)...
(1) Downwinding SUP-foil-style with a kite doesn't work because when you hook into a swell and go 14 knots downwind in a 15 knot lull your kite falls out of the sky. Even when your apparent wind doesn't drop that low, you have to constantly worry about where the kite is and whether your lines are going to go slack. And this observation is from guys like Sky who have credible kite skills.
(2) Downwinding SUP-foil-style with a windsurfing rig doesn't work because you want to constantly turn from heel side to toe side to heel side while working and connecting the swells. Doing that with a windsurfing rig is incredibly difficult and you lose the feel of surfing.
(3) The 5 meter Foil Wing can get an 80kg rider foiling in 8 knots of wind.
Also, Ken, Sky, me, and everyone else here at Duotone are aware that this is not a new concept to put a hand-held wing on something. We know about Wing Weapon, Skimbat, Kitewing, Flash Austin and Slingshot's history here and much more. We aren't saying we invented this idea, but from what I can see and have heard, we've made a fun, new, reasonably easy-to-use toy that is implemented in such a way that it gives most of us a new way to get out and have fun on the water in the wind. No one is saying it's a replacement for kiteboarding or windsurfing or that it's a brand new idea, but it's fun and we all wanted to ride one so we're gonna make em. Isn't that what getting into this industry should be all about?
Again, I haven't even seen one of these things in person but I'm pretty excited to get my hands on one and give it a shot.
You can ask me questions if you want but I probably won't have any answers anytime soon.
-Dan