To say it very briefly we are talking mainly about a combination between what Makani was doing to ensure constant flying speed and what Kitemill is doing for power production.
We could use a prop/turbine or winch reeling to the same effect.
The basis is anyways the anti-gravity winch (prop) controller which states that the reeling speed of the winch is given by an average reel out speed plus the additional speed needed to exactly match the added power in the winch to the power performed by gravity in flight.
We are using this to great effect at the moment. The anti-gravity winch controller is simple to implement and quite effective to maintain constant flying speed.
Also the thrust prop and turbine solution is a little bit farfetched at current scales (1-300 kW) but simulations show that this could largely compensate for square cube losses in kite mass, thus also compensate for its own weight. Overall this could allow scaling some factor bigger before hitting the wall.
I may share a bit more in time, though I was not aware the patent was public before just now. So I havent really though through what to do with it.
I can also add that Kitemill is not paying the upkeep for this patent so I guess it may be considered free for all to use