Also a 54MP FF variation of the 4um architecture used in A6500 is said to be announced in the near future. This is the info I got from a source:
Got word on a new Sony FF sensor, Exmor R, 54MP, 4um photosite, essentially a full frame version of A6500 sensor. Also, Sony Semicon supplied Fujifilm the sensor for X-T3, the latest gen 3.76um photosite architecture seen on IMX411/IMX461 medium format sensors, BSI+copper interconnect+16bit ADC.