Sonyalpharumors just reported the following rumor:
“The RX100 camera series is a unique and very successful camera line. But Sony shared the RX100M3 sensor to Panasonic (for the FZ-1000). And according to two m0re anonymous sources they are also likely going to share it to Fuji and Samsung as well!”
I remind you that Fuji’s APS-C sensors are already manufactured by Sony.