When Ferrari introduced the FXX and called buyers "factory test drivers", I thought it was just a little marketing to get wealthy men to part with $2,000,000 for a car. But after reading about how they selected the buyers and the telemetry they're recording from sessions, I can see that they are using this to develop the "next Enzo."
The real genius of modern Ferraris is in the electronics: The mannetino switch and e-diff in the F430 is just plain brilliant in managing the capabilities of the car to make everyone a hero. The systems actually anticipate the movement of the vehicle based on pre-determined parameters programmed by the engineers.
In the case of the FXX, they have actual customers of mediocre to fairly good driving skills push the vehicle to its limits, mapping out how the vehicle will behave for those interested in creating a streetable version. For this reason I think this new car (F-whatever) will likely have horsepower and power/weight ratios similar to the FXX.