HyperSync is a feature exclusive to PocketWizard radios that allows you to shoot at speeds faster than your cameras X-Sync while using studio strobes.
Unlike HSS/Auto-FP (High Speed Sync) which allows speedlights to sync up to 1/8000th with pulsed light, HyperSync uses precise timing to capture the most flash energy in the frame. If you are curious about how HyperSync works on a more scientific level and how it differs from HSS.
visit //wiki.pocketwizard.com/index.php?title=HyperSync to know more.
Specially when shooting outdoors with flash, HyperSync will allow tremendous control on mixing Day Light and Flashlight.
In simple words in normal X-Sync the flash resides within the shutter speed. where as in HyperSync the shutter speed resides within the Flash.
If you have any doubts or need more information, please feel free to email me