I don't know whether you want to know all the details, but essentially the USDA announces a quota increase of a fairly large volume—say, 150,000 tonnes. There are a few boatloads of semi-refined sugar waiting, from Mexico or Brazil. It's imported by the sugar refiner. Essentially, it's a means to keep the domestic market price higher for the refiners.
Of course, the users would have to buy that sugar at a higher price at a later date. So they wouldn't get it when they needed it, and then they would be locked into buying it at a later date.