Look over the history of Ferrari's Corse Cliente version and you'll see the original Enzo-based FXX was followed by an FXX Evoluzione, and the subsequent 599XX bred a similarly enhanced 599XX Evoluzione. It would stand to reason, then, that an FXX K Evoluzione could be in the cards, but it won't come anytime soon.
Speaking with Autocar, Ferrari test driver, former grand prix pilot and Le Mans winner Marc Gené said, "Right now, I think we cannot improve" on the FXX K, "but no doubt something will come up. I wouldn't be surprised if it happens, but it won't be in two years." Approximately three years separated the debut of the FXX and FXX Evo, but the 599XX was only out for a year or two before the 599XX Evoluzione came around.
If and when a FXX K Evo does arrive, Gené figures it will focus more on weight reduction, efficiency and handling than on power. As it is, the FXX K already produces 1,035 horsepower, after all. Given the nature of the XX development program, however, owners of the FXX K can expect their track machine to get incrementally more advanced as the Prancing Horse marque uses the program to test new components.