tt strap
To me, it looks like a tension torsion strap sticks out of the hub to restrain the blades from flinging off, while allowing the blade to pitch, The root end of the blade just pivots on bearings which are housed in the part of the head you can see. I'm guessing the pitch horn is on the root end of the blade. You can see the swashplate in a fairly conventional position.
This is different from Commanche, which was a bearingless MR design. All the classic degrees of freedom are achieved through a flex beam.
A rigid rotor doesn't flap, except by aeroelastics. It is hardly a new idea. The first was probably Juan de la Cierva's early autogyro, which tended to roll over and crash as speed increased. This ulitimately led to the invention of the flap and lead-lag hinges, much to the benefit of helicopters to follow. Additionally, the Sikorsky XH59 (ABC) had fully rigid rotors.
It will be interesting to see how well the Hummingbird works in forward flight. In a coax, like the ABC, the dissymetry of lift is canceled between the rotors, so it doesn't roll into the ground with increasing speed. Recently, the Phantom Works balled up the second Canard Rotor Wing, another rigid rotor. I wonder if they didn't have enough cyclic to counter the rolling moment from the rigid rotors, and merely did a historic reenactment of Juan de la Cierva's early work. In theory, you can stick in enough cyclic to make up for the missing flapping hinge, though in practice rotor flapping does an awful lot to equalize the dissymetry of lift.
-- IFMU