Novus Light discusses Sony proprietary Scalable Low Voltage Signalling with an Embedded Clock (SLVS-EC) interface, which debuts in the company's next generation of image sensors for industrial applications. The interface has been mentioned quite a long time ago in Sony papers such as this one, allowing to output signal independently from 4 corners of the chip:
In SLVS-EC, the clock signal is embedded in the data and recovered by dedicated circuitry on the receive side. Since the signals are then less sensitive to skew, the data can be transmitted at much higher data rates and over much further distances. Each of the SLVDS-EC channels can support speeds of up to 2.304Gbit/sec. The result is that a sensor that supports the new standard will be able to transfer data over eight links at a data rate of 1.84GBytes/sec (80% of full bandwidth due to 8b10b encoding).
I'm not sure what is the difference between MIPI M-PHY and SLVDS-EC, but Sony promotes its high speed: