This current flight sale isn't so good

Every year, I wait until late August-Early Sept to book my PE flight to Montego Bay. I normally pay anything between £740-£750 each time, well for the last 4 years anyway. However, that route is currently not in the sale. Prices are coming up £1200. Does anyone know how these sales work? Is there a likelihood that they may add more routes to the sale which goes on until 21 Sept. Thanks