Assuming it is the same sensor technology as is used in the AK-UC4000 camera that was released about a year ago, it is a 4.4K (11 MP) sensor with an internal conversion lens. Sensor size is about 1-inch, so larger than the 2/3-inch broadcast standard, but not dramatically so. The internal conversion lens allows for standard B4 lenses designed for 2/3" 3-chip cameras to be used with the larger single CMOS sensor.Does it need special lenses that cover the larger than 2/3 inch sensor? Obviously if it is using the "standard" b4 lenses, the image circle is pretty small, and the sensor is pretty deep in the mount.
There is a page describing this larger sensor approach on Panasonic's website:
https://na.panasonic.com/us/lssiel-imaging-system-broadcast-cameras
I'm not exactly sure where the new AJ-CX4000GJ camera fits in the broadcast lineup, but the AK-UC4000 sells for $40,000. I believe the existing UC4000 camera is designed for studio and multi-camera usage (so just live output, no internal recording). This new CX4000 camera seems like it may be built around the same basic camera platform, but is designed more for mobile broadcast/field usage, hence the inclusion of the internal recording and live streaming capabilities.