For weird reasons...
apparently (according to one of the rossi reps I know) you couldnt get the forward pressure right, and racers didnt like that or something, forcing rossi to change it's design. I think its retarded, because any FKS I have ever seen has never really had problems with forward pressure.
I know that it will come back someday though... racing is going out and with the demand for the turntable from people out here, I'm sure in like.. 2 or 3 years they will bring back something like the FKS...