Yes, they have mentioned some variations will come to the 747! I posted about the FPD a while ago, and they responded that they will be brining in one of the newer style "barrel" FPDs as an option. This will be a good way to make the different variants "feel" different to the simmer. Without these slight variations, there is not much difference between the -100 & -200, for instance. The way I think would be most representative of most fleets and the progression of technology would be as follows:
747-100
Approach Auto-Throttle
Basic Dual AP Approach Auto-Throttle FPD
No EPRL computer installed (Thrust & EPR Limits set manually according to charts)
747-200
FFRATS
FFRATS style "Barrel" FPD (Dual AP 3-column type)
FFRATS style EPRL computer
747SP
Approach Auto-Throttle
Non-FFRATS, Dual AP, style "light cap" FPD
Non-FFRATS Style EPRL Computer Style 2.
747-300
Same as -200
if they want to get fancy, they could give the -300 triple autopilot channels, in which case it would have the following:
FFRATS
FFRATS style "Barrel" FPD (Triple AP 4-column type)
FFRATS style EPRL computer
This would make each different variant feel unique in the way each is operated.