Their are applying the Coanda Effect on the trailing edge in order to create directional control. Thats evidenced by the fact that in the trailing edge image shown you see a round center section and the gap where the air is expelled at higher velocity top or bottom.
I would then guess that they have air circuits and valves to proportion the air to a section of the wing to effectively make ailreons and elevators from varying the air flow. Top and bottom 2 ailerons and 2 elevators for example means 4 circuits and manifolds per wing and you have control.

Very simple and elegant solution there. With computers to stabilize it and and further development this makes a lot of sense, well done!