This was the last race for the factory backed team. The cars will be available to privateers in next years IMSA series. With the growing popularity of the series, plus the growing field of different marques (Mercedes, Audi, Acura, Lexus, Porsche and Corvette) I would hope Ford will reappear sooner than later.
I'm guessing technical support will be available to those fielding the GT's next year from Ford, either directly or indirectly.