My understanding is that all the newer sails (2007) should measure under the new wording. Some of the earlier sails will too. However the vast majority of 06 and earlier sails will be marginally too large to measure in. If you recall at last years UK Nats, Geert demonstrated this point with the Blade sail and the two different Stealth sails he had available.

The amount of area under discussion is, I think, approx 0.06 sq m?