They're using OSB, or oriented strand board, which is actually stronger and more weather-resistant than plywood. Particle board is something else entirely, and is never used on any surface that might be exposed to moisture. I'm confident that there will also be siding over the OSB to further protect it. The structure itself is what will protect it from wind and rains, not necessarily the exterior sheathing.
Amazing how many construction experts we have here. I'm not one either, but I have built (literally) a house in a hurricane zone. It's the way the walls are attached to the foundation, and the nails used to attach the sheathing and shingles, that protect the structure from the hurricane-force winds. OSB is a perfectly acceptable sheathing material in a hurricane zone.
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