What John wrote is correct.
Two opinions:
If the H16 is chosen there will be more countries willing to participate than if any other class is chosen. Even Paraguay would give it a try. Interestingly, this could be a reason NOT to choose the H16, for more countries translate into higher costs.

I'd like to see a winged F16 one design at the 2016 games, especially if they sell the boats afterwards... you know, I sold the beauty in the avatar...