A few days ago Sony announced 12.47MP IMX021 sensor with 28.4mm diagonal, which translates to 5.49um pixel. At 10.39fps speed the sensor is quite fast for a DSLR sensor.
Sony touts 12b column-parallel ADC, which allows "dual noise cancelling technology realizing high-precision noise reduction across both analog and digital circuits". However, no sensor noise numbers are released.
IMX021 production will be carried out at Sony Semiconductor Kyushu Corporation's Kumamoto Technology Center.