Nikon D860 & Nikon Z8 full frame cameras are rumored to feature 60MP sensor. Both Nikon FF cameras could use the Sony IMX455AQR sensor that will have 60MP, 8k video and native 64 ISO. Possible candidates for this sensor is the full frame Nikon D860 DSLR and the Nikon Z8 mirrorless cameras. 

The IMX455AQR sensor could be used in any other camera manufacturer’s new model. There is a better version of this sensor IMX551 and Sony will probably use it. It’s being said that the Sony 60MP sensor PDAF is supposed to be better than the Multi-CAM 20000 currently used in some Nikon cameras.
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https://www.dailycameranews.com/2019/05/nikon-d860-nikon-z8-rumored-to-feature-60mp-sensor/