Jake,
I can't really say for the F18 Worlds, that was a Hobie Cat France venue. Like each of the recent F18 events, they are... F18 events, not Tiger events, so there can be many changes that fit the F18 rules. We have not heard that there were any big new things they tried on those boats.
As far as this threads topic, the Aussie F18 event... according to Steve Fields when I spoke with him last week, the boats at the Aussie F18 event were stock. He can better confirm that if he gets a chance to post here.
At the North American Event. Only the top spot was a "factory" team and they were sailing a completely stock boat. We really cannot refer to Greg and Jacques as "pro" sailors either. They are office workers and hadn't even raced since the Alter Cup in the beginning of May. Hardly what you would think the description would be of a "pro" team.