The ORMA60 tris definately use curved asymmetric foils in the floats to gain some vertical lift. You should know, after all a broken "banana foil" cost Knut Frostad the first place in this years Oops cup. I think Wouter is pretty spot on in his assesment. Banana foils with the aim to lift only parts of the hull clear will be the first step for competitive foiling (in my opinion).
If we look at how the Moths developed, the foilers did not win in the beginning. Then they started to dominate under certain conditions. Now you 'need' a foiler to be competitive in their worlds. It takes time to develop, but foils