I was curious about this as well. Since the mast height and mainsail area are restricted, it basically means that all the boats are going to have the same size main (maybe some slight differences in the length of the foot depending on how full the leach is.)

However, if I remember right, the only restriction on the jib is its area. Although the leach and luff are indirectly limited by spinnaker hoist height, I doubt that anybody would want a jib that tall...