Tech in Asia got an early look at NHK open house exhibition, scheduled to open on May 29. One of the achievements is 133MP image sensor for 8K video cameras:
NHK also schedules a special lecture on bright future for 8K cameras for endoscopic applications.
Update: NHK publishes a flyer of the new sensor, showing its Bayer CFA:
Update #2: Gigazine publishes NHK poster saying that the sensor's speed is 60fps at 12b ADC resolution:
imager.no-mania.com speculates that the sensor is designed by Forza.
Update #3: NikkeiBP posts explanations on how 133MP resolution is used. The reason for the increased resolution is that 33MP needs to be maintained in each of RGB channels.