Yes David, you're right. The sensor has had some improvements but it's built on the basis of the Origin's, if I understood well what Jean-Pierre said. He enlighted the low smear ability of the sensor for instance, and put forth the fact that the high sensitivity is due to the low amount of lost space between pixels.
It's like the Alexa's sensor took benefit of the ARRI D-21's R&D, making the Alexa much cheaper than the D-21. They improve their sensors, but the basis is the same, making the new ones cheaper, therefore.