For my studio and wedding work I generally use a Nikon D800, if rumours are true the D8xx Z version to come after the D850 and Z7II will be coming in just over a year.
This is likely to be called either the Z8 or Z9. Its been confirmed that at least three prototypes are currently in the field being testing.
For me the most interesting prototype is the 60 MP, 16 bit A/D model with a 5,76 MP viewfinder, 120 Hz refresh rate, this is going to. be quite the studio and landscape beast and would work well for me.
Here is hoping that it comes in under £3K.