I was the only one with the old style Taipan sail. People who have sailed with both say that the new sail is about 1 to 3 minutes advantage in a normal race.
Upwind in our short races (and our good wind, and my heavy weight), I didn't notice very much difference, but on longer legs, perhaps it would be more obvious.
The main speed difference between boats seemed to be boat handling, especially downwind, where I lost out. I chose not to trap in any race. In the winds we experienced, most sailors seemed to agree that trapping downwind usually payed off. (The exception was the Mosquitos, which are very light, and sail low and fast sitting in downwind).
I'm not sure that these races will help answer your question Nick, other than anecdotally, sailors love the new sail. One comment was that when the right amount of downhaul is applied, the sail flicks off at the top when overpowered, and less sheeting is required.

PS - this was a great event, nice to meet all these keen sailors, and I learned a lot by being whipped by them!