Scott Babbage has posted his thoughts on what he thinks will be the form going into the Moth Worlds. Check it out on: http://scott.projectsomewhere.com/
He's pretty accurate with most things, and has clearly given some thought to it.
I guess the big question is the relative performance of the Bladerider to the rest of the fleet. If Rohan is correct in that sanding his foils will make him 20% faster and they've found another 10-15% of speed recently he should be winning races by considerable margins.... I somehow think it will be a little closer than that!