A little off topic but.....
I am wondering as there was a D3 (FX), D700 (FX) and D300(S) (DX), so will there be a D5 (FX), D550 or ?D850? (FX) and D500 (DX).
A D550 would be a FX 21MP FX camera with all the other features of the D500.
IF there is to be another D700 equivalent my take is
FX line:
D5 - 21mp (Multicam 20k)
D50 - 21mp (Multicam 3500FX or 20k)
D850 - 42mp (Multicam 20k and the Sony sensor)
D750 - 24mp (Multicam 20k)
D650 - 24mp (Multicam 3500FX)
Df2 - 21mp (Multicam 3500FX)
DX line:
D500 - 21mp (Multicam 20k)
D7500 - 24mp (Multicam 20k or Adv 3500DX and tilt screen)
D5600 - 24mp (Adv Multicam 3500DX and rotational screen)
D3500 - 24mp (Multicam 4800DX)