I believe the rules don't allow adjustable foils, hence the simplicity. The flying Moths have a rudder foil that can be adjusted with a twist of the tiller which allows them to constantly tweak the pitch of the boat.
I think the Kiwis are ahead of the pack on this one. I have seen plenty of footage of Emirates foiling fast and level. The footage I have seen of Oracle they always seem to have an awkward looking bow-up attitude.
It's gonna be crazy to see these beasts go head to head, although I fear it is going to be the usual, one boat is so much faster than the others that there is no contest.