I would expect that should the F18 tech committee look at curved boards and vote it in, there would be a long lead in... say 2years. Firstly this would allow manufactures to ensure they can complete all their R & D, and secondly it wouldn't out date boats over night...

But just as scarecrow said, "The F18 class has shown in the past that it is more concerned with level performance and cost effectiveness than being the fastest class on the water" i doubt you will see this go much past a general discussion.