The datasheet of IMX310 Exmor R sensor now has already leaked online. This Exmor R sensor has used on the Sony a9 (WW361847). From the datasheet, we can see that IMX310 sensor has 16 Bit, Global Reset Shutter, and on-chip dual gain HDR 96dB dynamic range.
Sony will not unlock these features even in the upcoming Sony a9 firmware V.5.00 & V.6.00. Maybe there will be new firmware updates in late 2019 to 2020, or Sony will release a9 II with this same IMX310 sensor with these amazing features.