My initial thoughts:
There are only '3' moving parts, but the inertia of the 'pistons' must be tremendous! What issues that raises with throttle response, seal wear, the ceramic balls, etc. remain to be seen. ( And aren't the balls moving and taking all the stress of guiding the massive cylinders through compression and exhaust cycles?)
It would seem to me that all of the motor's torque is being fed into the one central 'bearing' where the two shafts intersect. Could be an Achille's heel.
What effect will the moment of inertia of those really large rotating hemispheres have on the handling of a motorcycle? Depending on the attitude of the engine in the chassis, there might be some new forces for the frame and/or suspension to deal with.
Whatcha think a seal replacement job on one of these is gonna cost?!!
Looks like a wankel process that is twisted into another dimension. The 'rotors' are now HUGE, compression is accomplished by moving the cylinder 'walls' rather than the eccentric motion of the rotor in a static chamber, and any variable timing for the intake and/or exhaust to maximize efficiency would add a lot of complexity to the system.
I am certainly no engineer, but it looks like it might have specific applications: perhaps an optimumly tuned constant speed motor teamed with CVT transmission. I just think it is a long way from going down to your local dealer and buying one.
Bless 'em for thinking outside the box! I just wish someone would pursue hydrogen based fuel cells and the supporting infrastructure with as much passion. There is a heck of lot more hydrogen in the universe than petroleum ( or anything else for that matter ); plus you can drink the emissions!